diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/BugsnagService.cs b/src/ui/windows/TogglDesktop/TogglDesktop/BugsnagService.cs
index 71b298df49..f28b0155a3 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/BugsnagService.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/BugsnagService.cs
@@ -51,24 +51,26 @@ public static void Init()
             });
         });
 
-        Toggl.OnError += delegate(string errmsg, bool user_error)
-        {
-            Toggl.Debug(errmsg);
-            try
-            {
-                if (!user_error && bugsnag.Configuration.ReleaseStage != "development")
-                    NotifyBugsnag(new Exception(errmsg));
-            }
-            catch (Exception ex)
-            {
-                Toggl.Debug("Could not check if can notify bugsnag: " + ex);
-            }
-        };
+        Toggl.OnError.Subscribe(x => OnError(x.errorMessage, x.isUserError));
 
         Application.ThreadException += Application_ThreadException;
         AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;
     }
 
+    private static void OnError(string errorMessage, bool isUserError)
+    {
+        Toggl.Debug(errorMessage);
+        try
+        {
+            if (!isUserError && bugsnag.Configuration.ReleaseStage != "development")
+                NotifyBugsnag(new Exception(errorMessage));
+        }
+        catch (Exception ex)
+        {
+            Toggl.Debug("Could not check if can notify bugsnag: " + ex);
+        }
+    }
+
     private static void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
     {
         NotifyBugsnag(e.ExceptionObject as Exception);
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/Program.cs b/src/ui/windows/TogglDesktop/TogglDesktop/Program.cs
index 7cf5787de6..390eeb9cf6 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/Program.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/Program.cs
@@ -1,5 +1,7 @@
 using System;
 using System.Diagnostics;
+using System.Reactive.Linq;
+using System.Reactive.Subjects;
 using System.Reflection;
 using System.Windows.Interop;
 using System.Windows.Media;
@@ -10,10 +12,8 @@ namespace TogglDesktop
 static class Program
 {
     private static SingleInstanceManager<App> singleInstanceManager;
-    public static ulong UserId {
-        get;
-        private set;
-    }
+    private static readonly BehaviorSubject<ulong> UserIdSubject = new BehaviorSubject<ulong>(0);
+    public static ulong UserId => UserIdSubject.Value;
     public static bool IsLoggedIn => UserId > 0;
 
     [STAThread]
@@ -29,9 +29,7 @@ static void Main(string[] args)
 
     private static void OnBeforeStartup()
     {
-        Toggl.OnLogin += delegate (bool open, ulong user_id) {
-            UserId = user_id;
-        };
+        Toggl.OnLogin.Select(x => x.userId).Subscribe(UserIdSubject);
         BugsnagService.Init();
         singleInstanceManager.BeforeStartup -= OnBeforeStartup;
     }
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/Toggl.cs b/src/ui/windows/TogglDesktop/TogglDesktop/Toggl.cs
index f2a0c25cba..4612127f7d 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/Toggl.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/Toggl.cs
@@ -4,6 +4,9 @@
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
+using System.Reactive;
+using System.Reactive.Linq;
+using System.Reactive.Subjects;
 using System.Runtime.InteropServices;
 using System.Windows;
 using System.Windows.Input;
@@ -67,102 +70,6 @@ public enum DownloadStatus
 
     #endregion
 
-    #region callback delegates
-
-    public delegate void DisplayApp(
-        bool open);
-
-    public delegate void DisplayOverlay(
-        Int64 type);
-
-    public delegate void DisplayError(
-        string errmsg,
-        bool user_error);
-
-    public delegate void DisplaySyncState(
-        SyncState state);
-
-    public delegate void DisplayUnsyncedItems(
-        Int64 count);
-
-    public delegate void DisplayOnlineState(
-        OnlineState state);
-
-    public delegate void DisplayURL(
-        string url);
-
-    public delegate void DisplayLogin(
-        bool open,
-        UInt64 user_id);
-
-    public delegate void DisplayReminder(
-        string title,
-        string informative_text);
-
-    public delegate void DisplayTimeEntryList(
-        bool open,
-        List<TogglTimeEntryView> list,
-        bool show_load_more_button);
-
-    public delegate void DisplayAutocomplete(
-        List<TogglAutocompleteView> list);
-
-    public delegate void DisplayViewItems(
-        List<TogglGenericView> list);
-
-    public delegate void DisplayTimeEntryEditor(
-        bool open,
-        TogglTimeEntryView te,
-        string focused_field_name);
-
-    public delegate void DisplaySettings(
-        bool open,
-        TogglSettingsView settings);
-
-    public delegate void DisplayRunningTimerState(
-        TogglTimeEntryView te);
-
-    public delegate void DisplayStoppedTimerState();
-
-    public delegate void DisplayIdleNotification(
-        string guid,
-        string since,
-        string duration,
-        Int64 started,
-        string description);
-
-    public delegate void DisplayAutotrackerRules(
-        List<TogglAutotrackerRuleView> rules, string[] terms);
-
-    public delegate void DisplayAutotrackerNotification(
-        string projectName, ulong projectId, ulong taskId);
-
-    public delegate void DisplayUpdateDownloadState(
-        string url, DownloadStatus status);
-
-    public delegate void DisplayProjectColors(
-        string[] colors, ulong count);
-
-    public delegate void DisplayCountries(
-        List<TogglCountryView> list);
-
-    public delegate void DisplayPromotion(
-        long id);
-
-    public delegate void DisplayObmExperiment(
-        ulong id, bool included, bool seenBefore);
-
-    public delegate void DisplayPomodoro(
-        string title, string informativeText);
-
-    public delegate void DisplayPomodoroBreak(
-        string title, string informativeText);
-
-    public delegate void DisplayInAppNotification(
-        string title, string text, string button, string url);
-
-    #endregion
-
     #region api calls
 
     public static void LoadMore()
@@ -584,11 +491,6 @@ public static string UserEmail()
         return toggl_get_user_email(ctx);
     }
 
-    public static void FullSync()
-    {
-        toggl_fullsync(ctx);
-    }
-
     public static void Sync()
     {
         OnManualSync();
@@ -757,39 +659,108 @@ public static void TrackExpandAllDays()
 
     #endregion
 
-    #region callback events
-
-    public static event DisplayApp OnApp = delegate { };
-    public static event DisplayOverlay OnOverlay = delegate { };
-    public static event DisplayError OnError = delegate { };
-    public static event DisplayOnlineState OnOnlineState = delegate { };
-    public static event DisplayLogin OnLogin = delegate { };
-    public static event DisplayReminder OnReminder = delegate { };
-    public static event DisplayTimeEntryList OnTimeEntryList = delegate { };
-    public static event DisplayAutocomplete OnTimeEntryAutocomplete = delegate { };
-    public static event DisplayAutocomplete OnMinitimerAutocomplete = delegate { };
-    public static event DisplayAutocomplete OnProjectAutocomplete = delegate { };
-    public static event DisplayTimeEntryEditor OnTimeEntryEditor = delegate { };
-    public static event DisplayViewItems OnWorkspaceSelect = delegate { };
-    public static event DisplayViewItems OnClientSelect = delegate { };
-    public static event DisplayViewItems OnTags = delegate { };
-    public static event DisplaySettings OnSettings = delegate { };
-    public static event DisplayRunningTimerState OnRunningTimerState = delegate { };
-    public static event DisplayStoppedTimerState OnStoppedTimerState = delegate { };
-    public static event DisplayURL OnURL = delegate { };
-    public static event DisplayIdleNotification OnIdleNotification = delegate { };
-    public static event DisplayAutotrackerRules OnAutotrackerRules = delegate { };
-    public static event DisplayAutotrackerNotification OnAutotrackerNotification = delegate { };
-    public static event DisplaySyncState OnDisplaySyncState = delegate { };
-    public static event DisplayUnsyncedItems OnDisplayUnsyncedItems = delegate { };
-    public static event DisplayUpdateDownloadState OnDisplayUpdateDownloadState = delegate { };
-    public static event DisplayProjectColors OnDisplayProjectColors = delegate { };
-    public static event DisplayCountries OnDisplayCountries = delegate { };
-    public static event DisplayPromotion OnDisplayPromotion = delegate { };
-    public static event DisplayObmExperiment OnDisplayObmExperiment = delegate { };
-    public static event DisplayPomodoro OnDisplayPomodoro = delegate { };
-    public static event DisplayPomodoroBreak OnDisplayPomodoroBreak = delegate { };
-    public static event DisplayInAppNotification OnDisplayInAppNotification = delegate { };
+    #region library events as observables
+
+    private static readonly Subject<bool> _onApp = new Subject<bool>();
+    public static readonly IObservable<bool> OnApp = _onApp.AsObservable();
+
+    private static readonly Subject<long> _onOverlay = new Subject<long>();
+    public static readonly IObservable<long> OnOverlay = _onOverlay.AsObservable();
+
+    private static readonly Subject<(string, bool)> _onError = new Subject<(string,bool)>();
+    public static readonly IObservable<(string errorMessage, bool isUserError)> OnError = _onError.AsObservable();
+
+    private static readonly Subject<OnlineState> _onOnlineState = new Subject<OnlineState>();
+    public static readonly IObservable<OnlineState> OnOnlineState = _onOnlineState.AsObservable();
+
+    private static readonly Subject<(bool, ulong)> _onLogin = new Subject<(bool, ulong)>();
+    public static readonly IObservable<(bool open, ulong userId)> OnLogin = _onLogin.AsObservable();
+
+    private static readonly Subject<(string, string)> _onReminder = new Subject<(string, string)>();
+    public static readonly IObservable<(string title, string informativeText)> OnReminder = _onReminder.AsObservable();
+
+    private static readonly Subject<(bool, List<TogglTimeEntryView>, bool)> _onTimeEntryList = new Subject<(bool, List<TogglTimeEntryView>, bool)>();
+    public static readonly IObservable<(bool open, List<TogglTimeEntryView> list, bool showLoadMore)> OnTimeEntryList =_onTimeEntryList.AsObservable();
+
+    private static readonly Subject<List<TogglAutocompleteView>> _onTimeEntryAutocomplete = new Subject<List<TogglAutocompleteView>>();
+    public static readonly IObservable<List<TogglAutocompleteView>> OnTimeEntryAutocomplete = _onTimeEntryAutocomplete.AsObservable();
+
+    private static readonly Subject<List<TogglAutocompleteView>> _onMinitimerAutocomplete = new Subject<List<TogglAutocompleteView>>();
+    public static readonly IObservable<List<TogglAutocompleteView>> OnMinitimerAutocomplete = _onMinitimerAutocomplete.AsObservable();
+
+    private static readonly Subject<List<TogglAutocompleteView>> _onProjectAutocomplete = new Subject<List<TogglAutocompleteView>>();
+    public static readonly IObservable<List<TogglAutocompleteView>> OnProjectAutocomplete = _onProjectAutocomplete.AsObservable();
+
+    private static readonly Subject<(bool, TogglTimeEntryView, string)> _onTimeEntryEditor = new Subject<(bool, TogglTimeEntryView, string)>();
+    public static readonly IObservable<(bool open, TogglTimeEntryView timeEntry, string focusedFieldName)>
+        OnTimeEntryEditor = _onTimeEntryEditor.AsObservable();
+
+    private static readonly Subject<List<TogglGenericView>> _onWorkspaceSelect = new Subject<List<TogglGenericView>>();
+    public static readonly IObservable<List<TogglGenericView>> OnWorkspaceSelect = _onWorkspaceSelect.AsObservable();
+
+    private static readonly Subject<List<TogglGenericView>> _onClientSelect = new Subject<List<TogglGenericView>>();
+    public static readonly IObservable<List<TogglGenericView>> OnClientSelect = _onClientSelect.AsObservable();
+
+    private static readonly Subject<List<TogglGenericView>> _onTags = new Subject<List<TogglGenericView>>();
+    public static readonly IObservable<List<TogglGenericView>> OnTags = _onTags.AsObservable();
+
+    private static readonly Subject<(bool, TogglSettingsView)> _onSettings = new Subject<(bool, TogglSettingsView)>();
+    public static readonly IObservable<(bool open, TogglSettingsView settings)> OnSettings = _onSettings.AsObservable();
+
+    private static readonly Subject<TogglTimeEntryView> _onRunningTimerState = new Subject<TogglTimeEntryView>();
+    public static readonly IObservable<TogglTimeEntryView> OnRunningTimerState = _onRunningTimerState.AsObservable();
+
+    private static readonly Subject<Unit> _onStoppedTimerState = new Subject<Unit>();
+    public static readonly IObservable<Unit> OnStoppedTimerState = _onStoppedTimerState.AsObservable();
+
+    private static readonly Subject<string> _onURL = new Subject<string>();
+    public static readonly IObservable<string> OnURL = _onURL.AsObservable();
+
+    private static readonly Subject<(string, string, string, long, string)> _onIdleNotification = new Subject<(string, string, string, long, string)>();
+    public static readonly IObservable<(string, string, string, long, string)> OnIdleNotification = _onIdleNotification.AsObservable();
+
+    private static readonly Subject<List<TogglAutotrackerRuleView>> _onAutotrackerRules = new Subject<List<TogglAutotrackerRuleView>>();
+    public static readonly IObservable<List<TogglAutotrackerRuleView>> OnAutotrackerRules = _onAutotrackerRules.AsObservable();
+
+    private static readonly Subject<(string, ulong, ulong)> _onAutotrackerNotification = new Subject<(string, ulong, ulong)>();
+    public static readonly IObservable<(string projectName, ulong projectId, ulong taskId)> OnAutotrackerNotification =
+        _onAutotrackerNotification.AsObservable();
+
+    private static readonly Subject<SyncState> _onDisplaySyncState = new Subject<SyncState>();
+    public static readonly IObservable<SyncState> OnDisplaySyncState = _onDisplaySyncState.AsObservable();
+
+    private static readonly Subject<long> _onDisplayUnsyncedItems = new Subject<long>();
+    public static readonly IObservable<long> OnDisplayUnsyncedItems = _onDisplayUnsyncedItems.AsObservable();
+
+    private static readonly Subject<(string, DownloadStatus)> _onDisplayUpdateDownloadState = new Subject<(string, DownloadStatus)>();
+    public static readonly IObservable<(string url, DownloadStatus status)> OnDisplayUpdateDownloadState =
+        _onDisplayUpdateDownloadState.AsObservable();
+
+    private static readonly Subject<string[]> _onDisplayProjectColors = new Subject<string[]>();
+    public static readonly IObservable<string[]> OnDisplayProjectColors = _onDisplayProjectColors.AsObservable();
+
+    private static readonly Subject<List<TogglCountryView>> _onDisplayCountries = new Subject<List<TogglCountryView>>();
+    public static readonly IObservable<List<TogglCountryView>> OnDisplayCountries = _onDisplayCountries.AsObservable();
+
+    private static readonly Subject<long> _onDisplayPromotion = new Subject<long>();
+    public static readonly IObservable<long> OnDisplayPromotion = _onDisplayPromotion.AsObservable();
+
+    private static readonly Subject<(ulong, bool, bool)> _onDisplayObmExperiment = new Subject<(ulong, bool, bool)>();
+    public static readonly IObservable<(ulong id, bool included, bool seenBefore)> OnDisplayObmExperiment =
+        _onDisplayObmExperiment.AsObservable();
+
+    private static readonly Subject<(string title, string informativeText)> _onDisplayPomodoro = new Subject<(string title, string informativeText)>();
+    public static readonly IObservable<(string title, string informativeText)> OnDisplayPomodoro =
+        _onDisplayPomodoro.AsObservable();
+
+    private static readonly Subject<(string title, string informativeText)> _onDisplayPomodoroBreak = new Subject<(string title, string informativeText)>();
+    public static readonly IObservable<(string title, string informativeText)> OnDisplayPomodoroBreak =
+        _onDisplayPomodoroBreak.AsObservable();
+
+    private static readonly Subject<(string title, string button, string text, string url)> _onDisplayInAppNotification =
+        new Subject<(string title, string button, string text, string url)>();
+    public static readonly IObservable<(string title, string button, string text, string url)> OnDisplayInAppNotification =
+        _onDisplayInAppNotification.AsObservable();
 
     private static void listenToLibEvents()
     {
@@ -797,7 +768,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnApp"))
             {
-                OnApp(open);
+                _onApp.OnNext(open);
             }
         });
 
@@ -805,7 +776,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnOverlay"))
             {
-                OnOverlay(type);
+                _onOverlay.OnNext(type);
             }
         });
 
@@ -813,7 +784,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnError, user_error: {1}, message: {0}", errmsg, user_error))
             {
-                OnError(errmsg, user_error);
+                _onError.OnNext((errmsg, user_error));
             }
         });
 
@@ -821,14 +792,14 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnDisplaySyncState, state: {0}", state))
             {
-                OnDisplaySyncState((SyncState)state);
+                _onDisplaySyncState.OnNext((SyncState)state);
             }
         });
         toggl_on_unsynced_items(ctx, count =>
         {
             using (Performance.Measure("Calling OnDisplayUnsyncedItems, count: {0}", count))
             {
-                OnDisplayUnsyncedItems(count);
+                _onDisplayUnsyncedItems.OnNext(count);
             }
         });
 
@@ -836,7 +807,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnOnlineState, state: {0}", state))
             {
-                OnOnlineState((OnlineState)state);
+                _onOnlineState.OnNext((OnlineState)state);
             }
         });
 
@@ -844,7 +815,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnLogin"))
             {
-                OnLogin(open, user_id);
+                _onLogin.OnNext((open, user_id));
             }
         });
 
@@ -852,7 +823,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnReminder, title: {0}", title))
             {
-                OnReminder(title, informative_text);
+                _onReminder.OnNext((title, informative_text));
             }
         });
 
@@ -860,7 +831,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnTimeEntryList, open: {0}", open))
             {
-                OnTimeEntryList(open, convertToTimeEntryList(first), show_load_more_button);
+                _onTimeEntryList.OnNext((open, convertToTimeEntryList(first), show_load_more_button));
             }
         });
 
@@ -868,7 +839,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnTimeEntryAutocomplete"))
             {
-                OnTimeEntryAutocomplete(convertToAutocompleteList(first));
+                _onTimeEntryAutocomplete.OnNext(convertToAutocompleteList(first));
             }
         });
 
@@ -876,7 +847,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnMinitimerAutocomplete"))
             {
-                OnMinitimerAutocomplete(convertToAutocompleteList(first));
+                _onMinitimerAutocomplete.OnNext(convertToAutocompleteList(first));
             }
         });
 
@@ -884,7 +855,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnProjectAutocomplete"))
             {
-                OnProjectAutocomplete(convertToAutocompleteList(first));
+                _onProjectAutocomplete.OnNext(convertToAutocompleteList(first));
             }
         });
 
@@ -892,7 +863,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnTimeEntryEditor, focused field: {0}", focused_field_name))
             {
-                OnTimeEntryEditor(open, marshalStruct<TogglTimeEntryView>(te), focused_field_name);
+                _onTimeEntryEditor.OnNext((open, marshalStruct<TogglTimeEntryView>(te), focused_field_name));
             }
         });
 
@@ -900,7 +871,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnWorkspaceSelect"))
             {
-                OnWorkspaceSelect(convertToViewItemList(first));
+                _onWorkspaceSelect.OnNext(convertToViewItemList(first));
             }
         });
 
@@ -908,7 +879,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnClientSelect"))
             {
-                OnClientSelect(convertToViewItemList(first));
+                _onClientSelect.OnNext(convertToViewItemList(first));
             }
         });
 
@@ -916,7 +887,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnTags"))
             {
-                OnTags(convertToViewItemList(first));
+                _onTags.OnNext(convertToViewItemList(first));
             }
         });
 
@@ -924,7 +895,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnSettings"))
             {
-                OnSettings(open, marshalStruct<TogglSettingsView>(settings));
+                _onSettings.OnNext((open, marshalStruct<TogglSettingsView>(settings)));
             }
         });
 
@@ -934,13 +905,13 @@ private static void listenToLibEvents()
             {
                 using (Performance.Measure("Calling OnStoppedTimerState"))
                 {
-                    OnStoppedTimerState();
+                    _onStoppedTimerState.OnNext(Unit.Default);
                     return;
                 }
             }
             using (Performance.Measure("Calling OnRunningTimerState"))
             {
-                OnRunningTimerState(marshalStruct<TogglTimeEntryView>(te));
+                _onRunningTimerState.OnNext(marshalStruct<TogglTimeEntryView>(te));
             }
         });
 
@@ -948,7 +919,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnURL"))
             {
-                OnURL(url);
+                _onURL.OnNext(url);
             }
         });
 
@@ -956,7 +927,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnIdleNotification"))
             {
-                OnIdleNotification(guid, since, duration, started, description);
+                _onIdleNotification.OnNext((guid, since, duration, started, description));
             }
         });
 
@@ -964,7 +935,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnAutotrackerRules"))
             {
-                OnAutotrackerRules(convertToAutotrackerEntryList(first), list);
+                _onAutotrackerRules.OnNext(convertToAutotrackerEntryList(first));
             }
         });
 
@@ -972,7 +943,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnAutotrackerNotification"))
             {
-                OnAutotrackerNotification(name, project_id, task_id);
+                _onAutotrackerNotification.OnNext((name, project_id, task_id));
             }
         });
 
@@ -980,7 +951,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnUpdateDownloadState, v: {0}, state: {1}", version, state))
             {
-                OnDisplayUpdateDownloadState(version, (DownloadStatus)state);
+                _onDisplayUpdateDownloadState.OnNext((version, (DownloadStatus)state));
             }
         });
 
@@ -988,7 +959,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnProjectColors, count: {0}", count))
             {
-                OnDisplayProjectColors(colors, count);
+                _onDisplayProjectColors.OnNext(colors);
             }
         });
 
@@ -996,7 +967,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnCountries"))
             {
-                OnDisplayCountries(convertToCountryList(first));
+                _onDisplayCountries.OnNext(convertToCountryList(first));
             }
         });
 
@@ -1004,7 +975,7 @@ private static void listenToLibEvents()
         {
             using (Performance.Measure("Calling OnDisplayPromotino, id: {0}", id))
             {
-                OnDisplayPromotion(id);
+                _onDisplayPromotion.OnNext(id);
             }
         });
 
@@ -1014,28 +985,28 @@ private static void listenToLibEvents()
                 "Calling OnDisplatObmExperiment, id: {0}, included: {1}, seen: {2}",
                 id, included, seenBefore))
             {
-                OnDisplayObmExperiment(id, included, seenBefore);
+                _onDisplayObmExperiment.OnNext((id, included, seenBefore));
             }
         });
         toggl_on_pomodoro(ctx, (title, text) =>
         {
             using (Performance.Measure("Calling OnDisplayPomodoro"))
             {
-                OnDisplayPomodoro(title, text);
+                _onDisplayPomodoro.OnNext((title, text));
             }
         });
         toggl_on_pomodoro_break(ctx, (title, text) =>
         {
             using (Performance.Measure("Calling OnDisplayPomodoroBreak"))
             {
-                OnDisplayPomodoroBreak(title, text);
+                _onDisplayPomodoroBreak.OnNext((title, text));
             }
         });
         toggl_on_message(ctx, (title, text, button, url) =>
         {
             using (Performance.Measure("Calling OnDisplayInAppNotification"))
             {
-                OnDisplayInAppNotification(title, text, button, url);
+                _onDisplayInAppNotification.OnNext((title, text, button, url));
             }
         });
     }
@@ -1193,7 +1164,7 @@ private static void installPendingUpdates()
                 catch (Exception e)
                 {
                     BugsnagService.NotifyBugsnag(e);
-                    Toggl.OnError?.Invoke($"Unable to delete the file: {file.FullName}. Delete this file manually.", false);
+                    _onError.OnNext(($"Unable to delete the file: {file.FullName}. Delete this file manually.", false));
                 }
             }
 
@@ -1229,7 +1200,7 @@ private static Action createUpdateAction()
                 catch (Exception e)
                 {
                     BugsnagService.NotifyBugsnag(e);
-                    Toggl.OnError?.Invoke($"Unable to delete the file: {file.FullName}. Delete this file manually.", false);
+                    _onError.OnNext(($"Unable to delete the file: {file.FullName}. Delete this file manually.", false));
                 }
             }
             return null;
@@ -1252,7 +1223,7 @@ private static Action createUpdateAction()
             catch (Win32Exception e)
             {
                 BugsnagService.NotifyBugsnag(e);
-                Toggl.OnError?.Invoke("Unable to run the installer. Please update manually.", false);
+                _onError.OnNext(("Unable to run the installer. Please update manually.", false));
                 return;
             }
 
@@ -1263,7 +1234,7 @@ private static Action createUpdateAction()
             }
             else
             {
-                Toggl.OnError?.Invoke("Unable to run the installer. Please update manually.", false);
+                _onError.OnNext(("Unable to run the installer. Please update manually.", false));
             }
         };
     }
@@ -1476,12 +1447,12 @@ public static Int64 UnixFromDateTime(DateTime value)
 
     public static void NewError(string errmsg, bool user_error)
     {
-        OnError(errmsg, user_error);
+        _onError.OnNext((errmsg, user_error));
     }
 
     public static void OpenInBrowser(string url)
     {
-        OnURL(url);
+        _onURL.OnNext(url);
     }
 
     public static void ShowErrorAndNotify(string errmsg, Exception ex)
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/ExperimentManager.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/ExperimentManager.cs
index ac22dd0094..3bd491b4b8 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/ExperimentManager.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/ExperimentManager.cs
@@ -2,6 +2,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reactive.Linq;
 
 namespace TogglDesktop.Experiments
 {
@@ -22,7 +23,7 @@ public ExperimentManager(MainWindow mainWindow)
         {
             this.mainWindow = mainWindow;
 
-            Toggl.OnDisplayObmExperiment += this.onDisplayObmExperiment;
+            Toggl.OnDisplayObmExperiment.ObserveOnDispatcher().Subscribe(this.onDisplayObmExperiment);
 
             if (this.experiments.Any(e => e.Id == 0))
             {
@@ -40,10 +41,9 @@ public IEnumerable<ulong> CurrentExperumentIds
             get { return this.experiments.Select(e => e.Id); }
         }
 
-        private void onDisplayObmExperiment(ulong id, bool included, bool seenBefore)
+        private void onDisplayObmExperiment((ulong id, bool included, bool seenBefore) x)
         {
-            if (this.mainWindow.TryBeginInvoke(this.onDisplayObmExperiment, id, included, seenBefore))
-                return;
+            var (id, included, seenBefore) = x;
 
             var experiment = this.experiments.FirstOrDefault(e => e.Id == id);
 
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment101.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment101.cs
index 96ba9151d0..f5b4ee4eb7 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment101.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment101.cs
@@ -1,4 +1,7 @@
 
+using System;
+using System.Reactive.Linq;
+
 namespace TogglDesktop.Experiments
 {
     sealed class Experiment101 : ExperimentBase
@@ -13,7 +16,7 @@ public Experiment101()
         protected override void runIncluded(ExperimentParameters parameters)
         {
             this.parameters = parameters;
-            Toggl.OnRunningTimerState += this.onRunningTimerState;
+            Toggl.OnRunningTimerState.Take(1).Subscribe(this.onRunningTimerState);
         }
 
         private void onRunningTimerState(Toggl.TogglTimeEntryView te)
@@ -21,9 +24,6 @@ private void onRunningTimerState(Toggl.TogglTimeEntryView te)
             ExperimentHacks.RemoveEmptyStateFirstLine(this, this.parameters);
             this.parameters.TutorialManager.ActivateScreen<Experiment101Screen>();
             Toggl.SendObmAction(this.Id, "seen");
-
-            Toggl.OnRunningTimerState -= this.onRunningTimerState;
         }
-
     }
 }
\ No newline at end of file
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment101Screen.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment101Screen.xaml.cs
index d13fbe8342..9a5d1afc4b 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment101Screen.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment101Screen.xaml.cs
@@ -1,10 +1,12 @@
-
+using System;
+using System.Reactive.Disposables;
 using System.Windows;
 
 namespace TogglDesktop.Experiments
 {
     public partial class Experiment101Screen
     {
+        private IDisposable _subscription;
         public Experiment101Screen()
         {
             this.InitializeComponent();
@@ -15,24 +17,14 @@ protected override void initialise()
             Toggl.SetManualMode(false);
             Toggl.ViewTimeEntryList();
 
-            Toggl.OnStoppedTimerState += this.onStoppedTimerState;
-            Toggl.OnTimeEntryEditor += this.onTimeEntryEditor;
+            _subscription = new CompositeDisposable(
+                Toggl.OnStoppedTimerState.Subscribe(_ => this.quitTutorial()),
+                Toggl.OnTimeEntryEditor.Subscribe(_ => this.quitTutorial()));
         }
 
         protected override void cleanup()
         {
-            Toggl.OnStoppedTimerState -= this.onStoppedTimerState;
-            Toggl.OnTimeEntryEditor -= this.onTimeEntryEditor;
-        }
-
-        private void onTimeEntryEditor(bool open, Toggl.TogglTimeEntryView te, string f)
-        {
-            this.quitTutorial();
-        }
-
-        private void onStoppedTimerState()
-        {
-            this.quitTutorial();
+            _subscription.Dispose();
         }
 
         private void closeButtonClick(object sender, RoutedEventArgs e)
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment98Screen1.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment98Screen1.xaml.cs
index 2efa474d96..55715b3664 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment98Screen1.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment98Screen1.xaml.cs
@@ -1,4 +1,6 @@
 
+using System;
+using System.Reactive.Linq;
 using System.Windows;
 
 namespace TogglDesktop.Experiments
@@ -10,19 +12,20 @@ public Experiment98Screen1()
             this.InitializeComponent();
         }
 
+        private IDisposable _subscription;
         protected override void initialise()
         {
             Toggl.SetManualMode(false);
             Toggl.ViewTimeEntryList();
 
-            Toggl.OnRunningTimerState += this.onRunningTimerState;
+            _subscription = Toggl.OnRunningTimerState.Subscribe(this.onRunningTimerState);
 
             Toggl.SendObmAction(98, "seen_1");
         }
 
         protected override void cleanup()
         {
-            Toggl.OnRunningTimerState -= this.onRunningTimerState;
+            _subscription.Dispose();
         }
 
         private void onRunningTimerState(Toggl.TogglTimeEntryView te)
@@ -34,14 +37,12 @@ private void closeButtonClick(object sender, RoutedEventArgs e)
         {
             this.quitTutorial();
 
-            Toggl.OnRunningTimerState += this.openSecondScreenDelayed;
+            Toggl.OnRunningTimerState.Take(1).Subscribe(this.openSecondScreenDelayed);
         }
 
         private void openSecondScreenDelayed(Toggl.TogglTimeEntryView te)
         {
             this.activateScreen<Experiment98Screen2>();
-
-            Toggl.OnRunningTimerState -= this.openSecondScreenDelayed;
         }
     }
 }
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment98Screen2.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment98Screen2.xaml.cs
index 794590a032..f0a0f14b1f 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment98Screen2.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment98Screen2.xaml.cs
@@ -1,10 +1,12 @@
-
+using System;
+using System.Reactive.Disposables;
 using System.Windows;
 
 namespace TogglDesktop.Experiments
 {
     public partial class Experiment98Screen2
     {
+        private IDisposable _subscription;
         public Experiment98Screen2()
         {
             this.InitializeComponent();
@@ -12,27 +14,17 @@ public Experiment98Screen2()
 
         protected override void initialise()
         {
-            Toggl.OnStoppedTimerState += this.onStoppedTimerState;
-            Toggl.OnTimeEntryEditor += this.onTimeEntryEditor;
+            _subscription = new CompositeDisposable(
+                Toggl.OnStoppedTimerState.Subscribe(_ => this.quitTutorial()),
+                Toggl.OnTimeEntryEditor.Subscribe(_ => this.quitTutorial()));
 
             Toggl.SendObmAction(98, "seen_2");
         }
 
         protected override void cleanup()
         {
-            Toggl.OnStoppedTimerState -= this.onStoppedTimerState;
-            Toggl.OnTimeEntryEditor -= this.onTimeEntryEditor;
+            _subscription.Dispose();
         }
-
-        private void onStoppedTimerState()
-        {
-            this.quitTutorial();
-        }
-        private void onTimeEntryEditor(bool open, Toggl.TogglTimeEntryView te, string focused_field_name)
-        {
-            this.quitTutorial();
-        }
-
         private void closeButtonClick(object sender, RoutedEventArgs e)
         {
             this.quitTutorial();
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment99Screen.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment99Screen.xaml.cs
index ac7a2b9a46..6d1eb32d15 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment99Screen.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Experiments/implementations/Experiment99Screen.xaml.cs
@@ -1,4 +1,4 @@
-
+using System;
 using System.Windows;
 
 namespace TogglDesktop.Experiments
@@ -10,25 +10,20 @@ public Experiment99Screen()
             this.InitializeComponent();
         }
 
+        private IDisposable _subscription;
         protected override void initialise()
         {
             Toggl.SetManualMode(false);
             Toggl.ViewTimeEntryList();
 
-            Toggl.OnStoppedTimerState += this.onStoppedTimerState;
+            _subscription = Toggl.OnStoppedTimerState.Subscribe(_ => this.quitTutorial());
         }
 
         protected override void cleanup()
         {
-            Toggl.OnStoppedTimerState -= this.onStoppedTimerState;
+            _subscription.Dispose();
         }
 
-        private void onStoppedTimerState()
-        {
-            this.quitTutorial();
-        }
-
-
         private void closeButtonClick(object sender, RoutedEventArgs e)
         {
             this.quitTutorial();
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Notifications/NotificationManager.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Notifications/NotificationManager.cs
index 3619456ee9..5106454820 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Notifications/NotificationManager.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Notifications/NotificationManager.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Reactive.Linq;
 using System.Windows;
 using System.Windows.Controls.Primitives;
 using Hardcodet.Wpf.TaskbarNotification;
@@ -15,16 +16,15 @@ public NotificationManager(TaskbarIcon taskbarIcon, Window parentWindow)
             _taskbarIcon = taskbarIcon;
             _parentWindow = parentWindow;
 
-            Toggl.OnReminder += OnReminder;
-            Toggl.OnAutotrackerNotification += OnAutotrackerNotification;
-            Toggl.OnDisplayPomodoro += OnDisplayPomodoro;
-            Toggl.OnDisplayPomodoroBreak += OnDisplayPomodoro;
+            Toggl.OnReminder.ObserveOnDispatcher().Subscribe(OnReminder);
+            Toggl.OnAutotrackerNotification.ObserveOnDispatcher().Subscribe(OnAutotrackerNotification);
+            Toggl.OnDisplayPomodoro.ObserveOnDispatcher().Subscribe(OnDisplayPomodoro);
+            Toggl.OnDisplayPomodoroBreak.ObserveOnDispatcher().Subscribe(OnDisplayPomodoro);
         }
 
-        private void OnReminder(string title, string informativeText)
+        private void OnReminder((string title, string informativeText) x)
         {
-            if (_parentWindow.TryBeginInvoke(OnReminder, title, informativeText))
-                return;
+            var (title, informativeText) = x;
 
             void StartButtonClick()
             {
@@ -47,10 +47,9 @@ void StartButtonClick()
             }
         }
 
-        private void OnDisplayPomodoro(string title, string informativeText)
+        private void OnDisplayPomodoro((string title, string informativeText) x)
         {
-            if (_parentWindow.TryBeginInvoke(OnDisplayPomodoro, title, informativeText))
-                return;
+            var (title, informativeText) = x;
 
             void StartNewButtonClick()
             {
@@ -84,10 +83,9 @@ void ContinueLatestButtonClick()
             }
         }
 
-        private void OnAutotrackerNotification(string projectName, ulong projectId, ulong taskId)
+        private void OnAutotrackerNotification((string projectName, ulong projectId, ulong taskId) x)
         {
-            if (_parentWindow.TryBeginInvoke(OnAutotrackerNotification, projectName, projectId, taskId))
-                return;
+            var (projectName, projectId, taskId) = x;
 
             void StartButtonClick()
             {
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen2.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen2.xaml.cs
index 9d4576d566..9b6d5ae9fb 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen2.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen2.xaml.cs
@@ -1,4 +1,6 @@
 
+using System;
+
 namespace TogglDesktop.Tutorial
 {
     public partial class BasicTutorialScreen2
@@ -8,15 +10,16 @@ public BasicTutorialScreen2()
             this.InitializeComponent();
         }
 
+        private IDisposable _subscription;
         protected override void initialise()
         {
-            Toggl.OnRunningTimerState += this.onRunningTimerState;
+            _subscription = Toggl.OnRunningTimerState.Subscribe(this.onRunningTimerState);
             this.tutorialManager.Timer.DescriptionTextBoxTextChanged += this.onDescriptionTextChanged;
         }
 
         protected override void cleanup()
         {
-            Toggl.OnRunningTimerState -= this.onRunningTimerState;
+            _subscription.Dispose();
             this.tutorialManager.Timer.DescriptionTextBoxTextChanged -= this.onDescriptionTextChanged;
         }
 
@@ -32,6 +35,5 @@ private void onDescriptionTextChanged(object sender, string text)
 
             this.activateScreen<BasicTutorialScreen3>();
         }
-
     }
 }
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen3.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen3.xaml.cs
index e13f2a6227..485bd6eba6 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen3.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen3.xaml.cs
@@ -1,4 +1,5 @@
-
+using System;
+
 namespace TogglDesktop.Tutorial
 {
     public partial class BasicTutorialScreen3
@@ -8,14 +9,15 @@ public BasicTutorialScreen3()
             this.InitializeComponent();
         }
 
+        private IDisposable _subscription;
         protected override void initialise()
         {
-            Toggl.OnRunningTimerState += this.onRunningTimerState;
+            _subscription = Toggl.OnRunningTimerState.Subscribe(onRunningTimerState);
         }
 
         protected override void cleanup()
         {
-            Toggl.OnRunningTimerState -= this.onRunningTimerState;
+            _subscription.Dispose();
         }
 
         private void onRunningTimerState(Toggl.TogglTimeEntryView te)
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen4.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen4.xaml.cs
index 7fb60af929..928348f8c0 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen4.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen4.xaml.cs
@@ -1,8 +1,12 @@
 
+using System;
+using System.Reactive.Disposables;
+
 namespace TogglDesktop.Tutorial
 {
     public partial class BasicTutorialScreen4
     {
+        private IDisposable _subscription;
         public BasicTutorialScreen4()
         {
             this.InitializeComponent();
@@ -10,26 +14,14 @@ public BasicTutorialScreen4()
 
         protected override void initialise()
         {
-            Toggl.OnTimeEntryEditor += this.onTimeEntryEditor;
-            Toggl.OnStoppedTimerState += this.onStoppedTimerState;
+            _subscription = new CompositeDisposable(
+                Toggl.OnTimeEntryEditor.Subscribe(_ => this.activateScreen<BasicTutorialScreen5>()),
+                Toggl.OnStoppedTimerState.Subscribe(_ => this.activateScreen<BasicTutorialScreen7>()));
         }
 
         protected override void cleanup()
         {
-            Toggl.OnTimeEntryEditor -= this.onTimeEntryEditor;
-            Toggl.OnStoppedTimerState -= this.onStoppedTimerState;
+            _subscription.Dispose();
         }
-
-        private void onTimeEntryEditor(bool open, Toggl.TogglTimeEntryView te, string focusedFieldName)
-        {
-            this.activateScreen<BasicTutorialScreen5>();
-        }
-
-        private void onStoppedTimerState()
-        {
-            this.activateScreen<BasicTutorialScreen7>();
-        }
-
-
     }
 }
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen5.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen5.xaml.cs
index 633ec2e153..a29ebd186b 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen5.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen5.xaml.cs
@@ -1,10 +1,12 @@
-
-using System.Collections.Generic;
+using System;
+using System.Reactive.Disposables;
+using System.Reactive.Linq;
 
 namespace TogglDesktop.Tutorial
 {
     public partial class BasicTutorialScreen5
     {
+        private IDisposable _subscription;
         public BasicTutorialScreen5()
         {
             this.InitializeComponent();
@@ -12,29 +14,14 @@ public BasicTutorialScreen5()
 
         protected override void initialise()
         {
-            Toggl.OnTimeEntryList += this.onTimeEntryList;
-            Toggl.OnStoppedTimerState += this.onStoppedTimerState;
+            _subscription = new CompositeDisposable(
+                Toggl.OnTimeEntryList.Where(x => x.open).Subscribe(_ => this.activateScreen<BasicTutorialScreen6>()),
+                Toggl.OnStoppedTimerState.Subscribe(_ => this.activateScreen<BasicTutorialScreen7>()));
         }
 
         protected override void cleanup()
         {
-            Toggl.OnTimeEntryList -= this.onTimeEntryList;
-            Toggl.OnStoppedTimerState -= this.onStoppedTimerState;
+            _subscription.Dispose();
         }
-
-        private void onTimeEntryList(bool open, List<Toggl.TogglTimeEntryView> list, bool showLoadMoreButton)
-        {
-            if (!open)
-                return;
-
-            this.activateScreen<BasicTutorialScreen6>();
-        }
-
-
-        private void onStoppedTimerState()
-        {
-            this.activateScreen<BasicTutorialScreen7>();
-        }
-
     }
 }
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen6.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen6.xaml.cs
index eaea3c4ecc..40a68062f2 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen6.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen6.xaml.cs
@@ -1,4 +1,4 @@
-
+using System;
 namespace TogglDesktop.Tutorial
 {
     public partial class BasicTutorialScreen6
@@ -8,19 +8,15 @@ public BasicTutorialScreen6()
             this.InitializeComponent();
         }
 
+        private IDisposable _subscription;
         protected override void initialise()
         {
-            Toggl.OnStoppedTimerState += this.onStoppedTimerState;
+            _subscription = Toggl.OnStoppedTimerState.Subscribe(_ => this.activateScreen<BasicTutorialScreen7>());
         }
 
         protected override void cleanup()
         {
-            Toggl.OnStoppedTimerState -= this.onStoppedTimerState;
-        }
-
-        private void onStoppedTimerState()
-        {
-            this.activateScreen<BasicTutorialScreen7>();
+            _subscription.Dispose();
         }
     }
 }
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen7.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen7.xaml.cs
index 4a2f599489..d5ecc7bf9e 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen7.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/Tutorial/BasicTutorialScreen7.xaml.cs
@@ -1,10 +1,12 @@
 
-using System.Windows;
+using System;
+using System.Reactive.Disposables;
 
 namespace TogglDesktop.Tutorial
 {
     public partial class BasicTutorialScreen7
     {
+        private IDisposable _subscription;
         public BasicTutorialScreen7()
         {
             this.InitializeComponent();
@@ -12,23 +14,19 @@ public BasicTutorialScreen7()
 
         protected override void initialise()
         {
-            Toggl.OnRunningTimerState += this.onRunningTimerState;
-            Toggl.OnTimeEntryEditor += this.onTimerEntryEditor;
+            _subscription = new CompositeDisposable(
+                Toggl.OnRunningTimerState.Subscribe(this.onRunningTimerState),
+                Toggl.OnTimeEntryEditor.Subscribe(_ => this.quitTutorial()));
         }
 
         protected override void cleanup()
         {
-            Toggl.OnRunningTimerState -= this.onRunningTimerState;
-            Toggl.OnTimeEntryEditor -= this.onTimerEntryEditor;
+            _subscription.Dispose();
         }
 
         private void onRunningTimerState(Toggl.TogglTimeEntryView te)
         {
             this.quitTutorial();
         }
-        private void onTimerEntryEditor(bool open, Toggl.TogglTimeEntryView te, string focusedFieldName)
-        {
-            this.quitTutorial();
-        }
     }
 }
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/ViewModels/LoginViewModel.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/ViewModels/LoginViewModel.cs
index d7a6f5511f..7bf952acc6 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/ViewModels/LoginViewModel.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/ViewModels/LoginViewModel.cs
@@ -35,8 +35,10 @@ public LoginViewModel(Action refreshLoginBindings, Action refreshSignupBindings)
         {
             _refreshLoginBindings = refreshLoginBindings;
             _refreshSignupBindings = refreshSignupBindings;
-            Toggl.OnDisplayCountries += OnDisplayCountries;
-            Toggl.OnSettings += OnSettings;
+            Toggl.OnDisplayCountries
+                .ObserveOnDispatcher()
+                .ToPropertyEx(this, x => x.Countries);
+            Toggl.OnSettings.Subscribe(x => _httpClientFactory = HttpClientFactoryFromProxySettings(x.settings));
             this.WhenAnyValue(x => x.SelectedConfirmAction,
                     x => x == ConfirmAction.LogIn ? "Log in" : "Sign up")
                 .ToPropertyEx(this, x => x.ConfirmButtonText);
@@ -66,11 +68,10 @@ public LoginViewModel(Action refreshLoginBindings, Action refreshSignupBindings)
         public ReactiveCommand<Unit, Unit> ConfirmGoogleLoginSignupCommand { get; }
         public IObservable<bool> IsLoginSignupExecuting { get; }
 
-        [Reactive]
-        public IList<CountryViewModel> Countries { get; private set; }
+        public IList<Toggl.TogglCountryView> Countries { [ObservableAsProperty] get; }
 
         [Reactive]
-        public CountryViewModel SelectedCountry { get; set; }
+        public Toggl.TogglCountryView SelectedCountry { get; set; }
 
         [Reactive]
         public ConfirmAction SelectedConfirmAction { get; set; }
@@ -119,7 +120,7 @@ private void EnsureValidationApplied()
                     "A password is required");
                 _selectedCountryValidation = this.ValidationRule(
                     x => x.SelectedCountry,
-                    selectedCountry => selectedCountry != null,
+                    selectedCountry => selectedCountry.ID > 0,
                     "Please select country");
                 _isTosCheckedValidation = this.ValidationRule(
                     x => x.IsTosChecked,
@@ -215,20 +216,9 @@ private async void ConfirmGoogleLoginSignup()
             }
         }
 
-        private void OnDisplayCountries(List<Toggl.TogglCountryView> list)
-        {
-            var countriesVm = list.Select(c => new CountryViewModel(c)).ToArray();
-            Dispatcher.CurrentDispatcher.Invoke(() => { Countries = countriesVm; });
-        }
-
-        private void OnSettings(bool open, Toggl.TogglSettingsView settings)
-        {
-            _httpClientFactory = HttpClientFactoryFromProxySettings(settings);
-        }
-
         public async Task GoogleSignupAsync()
         {
-            await GoogleAuth(accessToken => Toggl.GoogleSignup(accessToken, SelectedCountry?.ID ?? default), "Signup");
+            await GoogleAuth(accessToken => Toggl.GoogleSignup(accessToken, SelectedCountry.ID), "Signup");
         }
 
         public async Task GoogleLoginAsync()
@@ -292,7 +282,7 @@ private async Task<bool> ConfirmAsync(Func<string, string, long, bool> confirmAc
         {
             var email = Email;
             var password = Password;
-            var selectedCountryId = SelectedCountry?.ID ?? -1;
+            var selectedCountryId = SelectedCountry.ID;
             return await Task.Run(() => confirmAction(email, password, selectedCountryId));
         }
 
@@ -319,18 +309,6 @@ private static HttpClientFactory HttpClientFactoryFromProxySettings(Toggl.TogglS
             return proxyHttpClientFactory;
         }
 
-        public class CountryViewModel
-        {
-            private readonly Toggl.TogglCountryView _countryView;
-            public CountryViewModel(Toggl.TogglCountryView countryView)
-            {
-                _countryView = countryView;
-            }
-
-            public string Name => _countryView.Name;
-            public long ID => _countryView.ID;
-        }
-
         private class ProxySupportedHttpClientFactory : HttpClientFactory
         {
             public bool UseProxy { get; set; }
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/ViewModels/PreferencesWindowViewModel.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/ViewModels/PreferencesWindowViewModel.cs
index b370f67e70..3c3fe27fe6 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/ViewModels/PreferencesWindowViewModel.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/ViewModels/PreferencesWindowViewModel.cs
@@ -44,10 +44,7 @@ public PreferencesWindowViewModel(ShowMessageBoxDelegate showMessageBox, Action
         {
             _showMessageBox = showMessageBox;
             _closePreferencesWindow = closePreferencesWindow;
-            var isLoggedIn = Observable.FromEvent<Toggl.DisplayLogin, bool>(
-                onNext => (open, userId) => { onNext(userId != 0); },
-                x => Toggl.OnLogin += x,
-                x => Toggl.OnLogin -= x);
+            var isLoggedIn = Toggl.OnLogin.Select(x => x.userId != 0);
             ClearCacheCommand = ReactiveCommand.Create(ClearCache, isLoggedIn.ObserveOnDispatcher());
 
             this.WhenAnyValue(x => x.ShowHideToggl)
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/AutotrackerNotification.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/AutotrackerNotification.xaml.cs
new file mode 100644
index 0000000000..74335220fc
--- /dev/null
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/AutotrackerNotification.xaml.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Reactive.Linq;
+using System.Windows;
+using System.Windows.Controls.Primitives;
+using System.Windows.Input;
+using Hardcodet.Wpf.TaskbarNotification;
+
+namespace TogglDesktop
+{
+    public partial class AutotrackerNotification
+    {
+        private ulong projectId;
+        private ulong taskId;
+
+        public AutotrackerNotification(TaskbarIcon icon, MainWindow mainWindow)
+            : base(icon, mainWindow)
+        {
+            this.InitializeComponent();
+            Toggl.OnAutotrackerNotification.ObserveOnDispatcher().Subscribe(this.onAutotrackerNotification);
+        }
+
+        private void onAutotrackerNotification((string projectName, ulong projectId, ulong taskId) x)
+        {
+            var (projectName, projectId, taskId) = x;
+            this.Message = @$"Start tracking ""{projectName}""?";
+            this.projectId = projectId;
+            this.taskId = taskId;
+
+            this.RemoveFromParent();
+
+            _icon.ShowNotification(this, PopupAnimation.Slide, TimeSpan.FromSeconds(6));
+        }
+
+        private void onStartButtonClick(object sender, RoutedEventArgs e)
+        {
+            Close();
+            Toggl.Start("", "", this.taskId, this.projectId, null, null);
+            _parentWindow.ShowOnTop();
+        }
+    }
+}
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/AutotrackerSettings.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/AutotrackerSettings.xaml.cs
index b2373244e0..8baa8f9bd6 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/AutotrackerSettings.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/AutotrackerSettings.xaml.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Reactive.Linq;
 using System.Windows;
 using System.Windows.Input;
 using TogglDesktop.AutoCompletion;
@@ -17,38 +18,15 @@ public AutotrackerSettings()
         {
             this.InitializeComponent();
 
-            Toggl.OnAutotrackerRules += this.onAutotrackerRules;
-            Toggl.OnProjectAutocomplete += this.onProjectAutocomplete;
+            Toggl.OnAutotrackerRules.ObserveOnDispatcher().Subscribe(this.fillRules);
+            Toggl.OnProjectAutocomplete
+                .Select(AutoCompleteControllers.ForProjects)
+                .ObserveOnDispatcher()
+                .Subscribe(this.projectAutoComplete.SetController);
         }
 
-        #region toggl events
-
-        private void onAutotrackerRules(List<Toggl.TogglAutotrackerRuleView> rules, string[] terms)
-        {
-            if (this.TryBeginInvoke(this.onAutotrackerRules, rules, terms))
-                return;
-
-            this.fill(rules, terms);
-        }
-
-        private void onProjectAutocomplete(List<Toggl.TogglAutocompleteView> list)
-        {
-            if (this.TryBeginInvoke(this.onProjectAutocomplete, list))
-                return;
-
-            this.projectAutoComplete.SetController(AutoCompleteControllers.ForProjects(list));
-        }
-
-        #endregion
-
         #region filling from data
 
-        private void fill(List<Toggl.TogglAutotrackerRuleView> rules, string[] terms)
-        {
-            // this.termAutoComplete.SetController(AutoCompleteControllers.ForStrings(terms));
-            this.fillRules(rules);
-        }
-
         private void fillRules(List<Toggl.TogglAutotrackerRuleView> rules)
         {
             this.rulesPanel.Children.Clear();
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/MiniTimer.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/MiniTimer.xaml.cs
index d7fc4afd27..d879964ffc 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/MiniTimer.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/MiniTimer.xaml.cs
@@ -1,5 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.Reactive;
+using System.Reactive.Linq;
 using System.Windows;
 using System.Windows.Input;
 using System.Windows.Threading;
@@ -24,9 +26,12 @@ public MiniTimer()
 
             this.setupSecondsTimer();
 
-            Toggl.OnMinitimerAutocomplete += this.onMiniTimerAutocomplete;
-            Toggl.OnRunningTimerState += this.onRunningTimerState;
-            Toggl.OnStoppedTimerState += this.onStoppedTimerState;
+            Toggl.OnMinitimerAutocomplete
+                .Select(AutoCompleteControllers.ForTimer)
+                .ObserveOnDispatcher()
+                .Subscribe(this.descriptionAutoComplete.SetController);
+            Toggl.OnRunningTimerState.ObserveOnDispatcher().Subscribe(this.onRunningTimerState);
+            Toggl.OnStoppedTimerState.ObserveOnDispatcher().Subscribe(this.onStoppedTimerState);
 
             this.resetUIState(false, true);
         }
@@ -50,24 +55,18 @@ private void setupSecondsTimer()
 
         #region toggl events
 
-        private void onStoppedTimerState()
+        private void onStoppedTimerState(Unit _)
         {
-            if (this.TryBeginInvoke(this.onStoppedTimerState))
-                return;
-
             using (Performance.Measure("timer responding to OnStoppedTimerState"))
             {
                 this.secondsTimer.IsEnabled = false;
                 this.resetUIState(false);
-                this.runningTimeEntry = default(Toggl.TogglTimeEntryView);
+                this.runningTimeEntry = default;
             }
         }
 
         private void onRunningTimerState(Toggl.TogglTimeEntryView te)
         {
-            if (this.TryBeginInvoke(this.onRunningTimerState, te))
-                return;
-
             using (Performance.Measure("timer responding to OnRunningTimerState"))
             {
                 this.runningTimeEntry = te;
@@ -76,17 +75,6 @@ private void onRunningTimerState(Toggl.TogglTimeEntryView te)
             }
         }
 
-        private void onMiniTimerAutocomplete(List<Toggl.TogglAutocompleteView> list)
-        {
-            if (this.TryBeginInvoke(this.onMiniTimerAutocomplete, list))
-                return;
-
-            using (Performance.Measure("timer building auto complete controller, {0} items", list.Count))
-            {
-                this.descriptionAutoComplete.SetController(AutoCompleteControllers.ForTimer(list));
-            }
-        }
-
         #endregion
 
         #region ui events
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/PomodoroNotification.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/PomodoroNotification.xaml.cs
new file mode 100644
index 0000000000..fe7c5e4a49
--- /dev/null
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/PomodoroNotification.xaml.cs
@@ -0,0 +1,54 @@
+using System;
+using System.Reactive.Linq;
+using System.Windows;
+using System.Windows.Controls.Primitives;
+using Hardcodet.Wpf.TaskbarNotification;
+
+namespace TogglDesktop
+{
+    public partial class PomodoroNotification
+    {
+        public PomodoroNotification(TaskbarIcon icon, MainWindow mainWindow)
+            : base(icon, mainWindow)
+        {
+            this.InitializeComponent();
+
+            Toggl.OnDisplayPomodoro.ObserveOnDispatcher().Subscribe(this.onDisplayPomodoro);
+            Toggl.OnDisplayPomodoroBreak.ObserveOnDispatcher().Subscribe(this.onDisplayPomodoro);
+        }
+
+        private void onDisplayPomodoro((string title, string informativeText) x)
+        {
+            var (title, informativeText) = x;
+
+            this.Message = informativeText;
+            this.Title = title;
+
+            this.RemoveFromParent();
+
+            if (!_icon.ShowNotification(this, PopupAnimation.Slide, null))
+            {
+                _icon.ShowBalloonTip(title, informativeText, Properties.Resources.toggl, largeIcon: true);
+            }
+            else
+            {
+                System.Media.SystemSounds.Asterisk.Play();
+            }
+        }
+
+        private void onContinueButtonClick(object sender, RoutedEventArgs e)
+        {
+            Close();
+            Toggl.ContinueLatest(true);
+        }
+
+        private void onStartNewButtonClick(object sender, RoutedEventArgs e)
+        {
+            Close();
+            var guid = Toggl.Start("", "", 0, 0, "", "", true);
+            _parentWindow.ShowOnTop();
+            if (guid != null)
+                Toggl.Edit(guid, true, Toggl.Description);
+        }
+    }
+}
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/ProjectColorPicker.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/ProjectColorPicker.xaml.cs
index 2ddc6f402d..08df458a65 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/ProjectColorPicker.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/ProjectColorPicker.xaml.cs
@@ -1,5 +1,6 @@
 
 using System;
+using System.Reactive.Linq;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Input;
@@ -34,14 +35,11 @@ public ProjectColorPicker()
             this.DataContext = this;
             this.InitializeComponent();
 
-            Toggl.OnDisplayProjectColors += this.onDisplayProjectColors;
+            Toggl.OnDisplayProjectColors.ObserveOnDispatcher().Subscribe(this.onDisplayProjectColors);
         }
 
-        private void onDisplayProjectColors(string[] strings, ulong count)
+        private void onDisplayProjectColors(string[] strings)
         {
-            if (this.TryBeginInvoke(this.onDisplayProjectColors, strings, count))
-                return;
-
             this.colors = strings;
             this.list.ItemsSource = strings;
         }
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/ReminderNotification.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/ReminderNotification.xaml.cs
new file mode 100644
index 0000000000..80f8f61846
--- /dev/null
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/ReminderNotification.xaml.cs
@@ -0,0 +1,42 @@
+using System;
+using System.Reactive.Linq;
+using System.Windows;
+using System.Windows.Controls.Primitives;
+using Hardcodet.Wpf.TaskbarNotification;
+
+namespace TogglDesktop
+{
+    public partial class ReminderNotification
+    {
+        public ReminderNotification(TaskbarIcon icon, MainWindow mainWindow)
+            : base(icon, mainWindow)
+        {
+            InitializeComponent();
+            Toggl.OnReminder.ObserveOnDispatcher().Subscribe(onReminder);
+        }
+
+        private void onReminder((string title, string informativeText) x)
+        {
+            var (title, informativeText) = x;
+            Title = title;
+            Message = informativeText;
+
+            this.RemoveFromParent();
+
+            if (!_icon.ShowNotification(this, PopupAnimation.Slide, TimeSpan.FromSeconds(10)))
+            {
+                _icon.ShowBalloonTip(title, informativeText, Properties.Resources.toggl, largeIcon: true);
+            }
+        }
+
+        private void onStartButtonClick(object sender, RoutedEventArgs e)
+        {
+            Close();
+            var guid = Toggl.Start("", "", 0, 0, "", "", true);
+            _parentWindow.ShowOnTop();
+            if (guid != null)
+                Toggl.Edit(guid, true, Toggl.Description);
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/StatusBar.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/StatusBar.xaml.cs
index 28b619b6b7..aaaa3b8e25 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/StatusBar.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/StatusBar.xaml.cs
@@ -1,49 +1,29 @@
 using System;
+using System.Reactive.Linq;
 using System.Windows;
 
 namespace TogglDesktop
 {
     public partial class StatusBar
     {
-        private Toggl.OnlineState onlineState;
-
         public StatusBar()
         {
             this.InitializeComponent();
 
-            Toggl.OnOnlineState += this.onOnlineState;
-            Toggl.OnLogin += this.onLogin;
+            Toggl.OnOnlineState
+                .CombineLatest(Toggl.OnLogin, GetState)
+                .ObserveOnDispatcher()
+                .Subscribe(onOnlineState);
         }
 
-        private void onLogin(bool open, ulong userID)
+        private static Toggl.OnlineState GetState(Toggl.OnlineState onlineState, (bool open, ulong userId) x)
         {
-            if (this.TryBeginInvoke(this.onLogin, open, userID))
-                return;
-
-            if (open)
-            {
-                this.Hide();
-            }
+            return x.userId == 0 ? Toggl.OnlineState.Online : onlineState;
         }
 
         private void onOnlineState(Toggl.OnlineState state)
         {
-            if (this.TryBeginInvoke(this.onOnlineState, state))
-                return;
-
-            this.onlineState = state;
-            this.update();
-        }
-
-        private void update()
-        {
-            if (!Program.IsLoggedIn)
-            {
-                this.Hide();
-                return;
-            }
-
-            switch (this.onlineState)
+            switch (state)
             {
                 case Toggl.OnlineState.Online:
                 {
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/SyncingIndicator.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/SyncingIndicator.xaml.cs
index b53f4ef90d..8aa7675fd8 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/SyncingIndicator.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/controls/SyncingIndicator.xaml.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Reactive.Linq;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Media.Animation;
@@ -19,9 +20,9 @@ public SyncingIndicator()
 
             this.spinnerAnimation = (Storyboard)this.Resources["RotateSpinner"];
 
-            Toggl.OnDisplaySyncState += this.onDisplaySyncState;
-            Toggl.OnDisplayUnsyncedItems += this.onDisplayUnsyncedItems;
-            Toggl.OnLogin += this.onLogin;
+            Toggl.OnDisplaySyncState.ObserveOnDispatcher().Subscribe(this.onDisplaySyncState);
+            Toggl.OnDisplayUnsyncedItems.ObserveOnDispatcher().Subscribe(this.onDisplayUnsyncedItems);
+            Toggl.OnLogin.Where(x => x.open).ObserveOnDispatcher().Subscribe(_ => this.Hide());
             Toggl.OnManualSync += this.onManualSync;
         }
 
@@ -32,31 +33,14 @@ private bool hasSomethingToShow
 
         #region toggl events
 
-        private void onLogin(bool open, ulong userID)
-        {
-            if (this.TryBeginInvoke(this.onLogin, open, userID))
-                return;
-
-            if (open)
-            {
-                this.Hide();
-            }
-        }
-
         private void onDisplayUnsyncedItems(long count)
         {
-            if (this.TryBeginInvoke(this.onDisplayUnsyncedItems, count))
-                return;
-
             this.unsyncedItems = count;
             this.update();
         }
 
         private void onDisplaySyncState(Toggl.SyncState state)
         {
-            if (this.TryBeginInvoke(this.onDisplaySyncState, state))
-                return;
-
             this.syncState = state;
             this.update();
         }
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/views/EditView.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/views/EditView.xaml.cs
index 76c045ef63..190f9e193f 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/views/EditView.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/views/EditView.xaml.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
+using System.Reactive.Linq;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Input;
@@ -19,7 +20,6 @@ public partial class EditView
     {
         private Toggl.TogglTimeEntryView timeEntry;
         private bool isInNewProjectMode = true;
-        private List<Toggl.TogglAutocompleteView> projects;
         private List<Toggl.TogglGenericView> clients;
         private List<Toggl.TogglGenericView> workspaces;
         private ulong selectedWorkspaceId;
@@ -33,22 +33,33 @@ public EditView()
             this.DataContext = this;
             this.InitializeComponent();
 
-            Toggl.OnLogin += this.onLogin;
-            Toggl.OnTimeEntryEditor += this.onTimeEntryEditor;
-            Toggl.OnMinitimerAutocomplete += this.onMinitimerAutocomplete;
-            Toggl.OnProjectAutocomplete += this.onProjectAutocomplete;
-            Toggl.OnClientSelect += this.onClientSelect;
-            Toggl.OnTags += this.onTags;
-            Toggl.OnWorkspaceSelect += this.onWorkspaceSelect;
-        }
-
-        private void onLogin(bool open, ulong userId)
+            Toggl.OnLogin.ObserveOnDispatcher().Subscribe(_ => this.onLogin());
+            Toggl.OnTimeEntryEditor.ObserveOnDispatcher().Subscribe(this.onTimeEntryEditor);
+            Toggl.OnMinitimerAutocomplete
+                .Select(AutoCompleteControllers.ForTimer)
+                .ObserveOnDispatcher()
+                .Subscribe(this.descriptionAutoComplete.SetController);
+            Toggl.OnProjectAutocomplete
+                .Select(AutoCompleteControllers.ForProjects)
+                .ObserveOnDispatcher()
+                .Subscribe(this.projectAutoComplete.SetController);
+            Toggl.OnClientSelect
+                .ObserveOnDispatcher()
+                .Subscribe(list => this.clients = list);
+            Toggl.OnClientSelect
+                .Select(AutoCompleteControllers.ForClients)
+                .ObserveOnDispatcher()
+                .Subscribe(this.clientAutoComplete.SetController);
+            Toggl.OnTags
+                .Select(list => list.Select(item => item.Name))
+                .ObserveOnDispatcher()
+                .Subscribe(tagList.SetKnownTags);
+            Toggl.OnWorkspaceSelect.ObserveOnDispatcher().Subscribe(this.onWorkspaceSelect);
+        }
+
+        private void onLogin()
         {
-            if (this.TryBeginInvoke(this.onLogin, open, userId))
-                return;
-
             this.timeEntry = new Toggl.TogglTimeEntryView();
-            this.projects = null;
             this.clients = null;
             this.workspaces = null;
         }
@@ -66,10 +77,9 @@ private bool hasTimeEntry()
 
         #region from time entry
 
-        private void onTimeEntryEditor(bool open, Toggl.TogglTimeEntryView timeEntry, string focusedFieldName)
+        private void onTimeEntryEditor((bool open, Toggl.TogglTimeEntryView timeEntry, string focusedFieldName) x)
         {
-            if (this.TryBeginInvoke(this.onTimeEntryEditor, open, timeEntry, focusedFieldName))
-                return;
+            var (open, timeEntry, focusedFieldName) = x;
 
             using (Performance.Measure("filling edit view from OnTimeEntryEditor"))
             {
@@ -225,61 +235,8 @@ private void durationUpdateTimerTick(object sender, string s)
 
         #endregion
 
-        #region auto completion
-
-        private void onMinitimerAutocomplete(List<Toggl.TogglAutocompleteView> list)
-        {
-            if (this.TryBeginInvoke(this.onMinitimerAutocomplete, list))
-                return;
-
-            using (Performance.Measure("building edit view entry auto complete controller, {0} items", list.Count))
-            {
-                this.descriptionAutoComplete.SetController(AutoCompleteControllers.ForTimer(list));
-            }
-        }
-
-        private void onProjectAutocomplete(List<Toggl.TogglAutocompleteView> list)
-        {
-            if (this.TryBeginInvoke(this.onProjectAutocomplete, list))
-                return;
-
-            this.projects = list;
-
-            using (Performance.Measure("building edit view project auto complete controller, {0} items", this.projects.Count))
-            {
-                this.projectAutoComplete.SetController(AutoCompleteControllers.ForProjects(list));
-            }
-        }
-
-        private void onClientSelect(List<Toggl.TogglGenericView> list)
-        {
-            if (this.TryBeginInvoke(this.onClientSelect, list))
-                return;
-
-            this.clients = list;
-
-            using (Performance.Measure("building edit view client auto complete controller, {0} items", this.clients.Count))
-            {
-                this.clientAutoComplete.SetController(AutoCompleteControllers.ForClients(list));
-            }
-        }
-
-        private void onTags(List<Toggl.TogglGenericView> list)
-        {
-            if (this.TryBeginInvoke(this.onTags, list))
-                return;
-
-            using (Performance.Measure("building edit view tags auto complete controller, {0} items", list.Count))
-            {
-                this.tagList.SetKnownTags(list.Select(m => m.Name));
-            }
-        }
-
         private void onWorkspaceSelect(List<Toggl.TogglGenericView> list)
         {
-            if (this.TryBeginInvoke(this.onWorkspaceSelect, list))
-                return;
-
             this.workspaces = list;
 
             using (Performance.Measure("building edit view workspace auto complete controller, {0} items", list.Count))
@@ -292,8 +249,6 @@ private void onWorkspaceSelect(List<Toggl.TogglGenericView> list)
 
         #endregion
 
-        #endregion
-
         #region change data
 
         #region time and date
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/views/Timer.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/views/Timer.xaml.cs
index e851633f61..3a018f0ad3 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/views/Timer.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/views/Timer.xaml.cs
@@ -1,5 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.Reactive;
+using System.Reactive.Linq;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Input;
@@ -30,9 +32,12 @@ public Timer()
 
             this.setupSecondsTimer();
 
-            Toggl.OnMinitimerAutocomplete += this.onMiniTimerAutocomplete;
-            Toggl.OnRunningTimerState += this.onRunningTimerState;
-            Toggl.OnStoppedTimerState += this.onStoppedTimerState;
+            Toggl.OnMinitimerAutocomplete
+                .Select(AutoCompleteControllers.ForTimer)
+                .ObserveOnDispatcher()
+                .Subscribe(this.descriptionAutoComplete.SetController);
+            Toggl.OnRunningTimerState.ObserveOnDispatcher().Subscribe(this.onRunningTimerState);
+            Toggl.OnStoppedTimerState.ObserveOnDispatcher().Subscribe(this.onStoppedTimerState);
 
             this.RunningTimeEntrySecondPulse += this.timerTick;
 
@@ -58,11 +63,8 @@ private void setupSecondsTimer()
 
         #region toggl events
 
-        private void onStoppedTimerState()
+        private void onStoppedTimerState(Unit _)
         {
-            if (this.TryBeginInvoke(this.onStoppedTimerState))
-                return;
-
             using (Performance.Measure("timer responding to OnStoppedTimerState"))
             {
                 this.secondsTimer.IsEnabled = false;
@@ -74,9 +76,6 @@ private void onStoppedTimerState()
 
         private void onRunningTimerState(Toggl.TogglTimeEntryView te)
         {
-            if (this.TryBeginInvoke(this.onRunningTimerState, te))
-                return;
-
             using (Performance.Measure("timer responding to OnRunningTimerState"))
             {
                 this.runningTimeEntry = te;
@@ -85,17 +84,6 @@ private void onRunningTimerState(Toggl.TogglTimeEntryView te)
             }
         }
 
-        private void onMiniTimerAutocomplete(List<Toggl.TogglAutocompleteView> list)
-        {
-            if (this.TryBeginInvoke(this.onMiniTimerAutocomplete, list))
-                return;
-
-            using (Performance.Measure("timer building auto complete controller, {0} items", list.Count))
-            {
-                this.descriptionAutoComplete.SetController(AutoCompleteControllers.ForTimer(list));
-            }
-        }
-
         #endregion
 
         #region ui events
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/views/TimerEntryListView.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/views/TimerEntryListView.xaml.cs
index c0a21fd1ee..a832388a2c 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/views/TimerEntryListView.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/views/TimerEntryListView.xaml.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reactive.Linq;
 using System.Windows;
 using System.Windows.Media;
 using System.Windows.Threading;
@@ -15,9 +16,12 @@ public TimerEntryListView()
         {
             this.InitializeComponent();
 
-            Toggl.OnTimeEntryEditor += this.onTimeEntryEditor;
-            Toggl.OnTimeEntryList += this.onTimeEntryList;
-            Toggl.OnLogin += this.onLogin;
+            Toggl.OnTimeEntryEditor.Select(x => x.timeEntry.GUID)
+                .ObserveOnDispatcher()
+                .Subscribe(this.Entries.SelectEntry);
+            Toggl.OnTimeEntryList.ObserveOnDispatcher().Subscribe(this.onTimeEntryList);
+            Toggl.OnLogin.Where(x => x.open || x.userId == 0).ObserveOnDispatcher()
+                .Subscribe(_ => this.Entries.Children.Clear());
         }
 
         public Brush TitleBarBrush => this.Timer.Background;
@@ -35,37 +39,14 @@ protected override void OnInitialized(EventArgs e)
 
         #region toggl events
 
-        private void onLogin(bool open, ulong userID)
+        private void onTimeEntryList((bool open, List<Toggl.TogglTimeEntryView> list, bool showLoadMoreButton) x)
         {
-            if (this.TryBeginInvoke(this.onLogin, open, userID))
-                return;
-
-            if (open || userID == 0)
-            {
-                this.Entries.Children.Clear();
-            }
-        }
-
-        private void onTimeEntryList(bool open, List<Toggl.TogglTimeEntryView> list, bool showLoadMoreButton)
-        {
-            if (this.TryBeginInvoke(this.onTimeEntryList, open, list, showLoadMoreButton))
-                return;
+            var (open, list, showLoadMoreButton) = x;
 
             this.fillTimeEntryList(list);
             this.Entries.ViewModel.OnTimeEntryList(showLoadMoreButton, list.Count == 0);
         }
 
-        private void onTimeEntryEditor(bool open, Toggl.TogglTimeEntryView te, string focusedFieldName)
-        {
-            if (this.TryBeginInvoke(this.onTimeEntryEditor, open, te, focusedFieldName))
-                return;
-
-            using (Performance.Measure("highlighting cell in list"))
-            {
-                this.Entries.SelectEntry(te.GUID);
-            }
-        }
-
         #endregion
 
         private void fillTimeEntryList(List<Toggl.TogglTimeEntryView> list)
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/AboutWindow.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/AboutWindow.xaml.cs
index 94d8c0fa46..b33e7e6c20 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/AboutWindow.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/AboutWindow.xaml.cs
@@ -1,9 +1,8 @@
 using System;
-using System.Diagnostics;
 using System.Linq;
+using System.Reactive.Linq;
 using System.Windows;
 using System.Windows.Controls;
-using System.Windows.Input;
 
 namespace TogglDesktop
 {
@@ -24,13 +23,12 @@ public AboutWindow()
             this.releaseChannelComboBox.ShowOnlyIf(!isUpdatCheckDisabled, true);
             this.releaseChannelLabel.ShowOnlyIf(!isUpdatCheckDisabled, true);
 
-            Toggl.OnDisplayUpdateDownloadState += this.onDisplayUpdateDownloadState;
+            Toggl.OnDisplayUpdateDownloadState.ObserveOnDispatcher().Subscribe(this.onDisplayUpdateDownloadState);
         }
 
-        private void onDisplayUpdateDownloadState(string version, Toggl.DownloadStatus status)
+        private void onDisplayUpdateDownloadState((string version, Toggl.DownloadStatus status) x)
         {
-            if (this.TryBeginInvoke(this.onDisplayUpdateDownloadState, version, status))
-                return;
+            var (version, status) = x;
 
             string format;
             switch (status)
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/EditViewPopup.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/EditViewPopup.xaml.cs
index 2df31ff2bb..a6090fee48 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/EditViewPopup.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/EditViewPopup.xaml.cs
@@ -1,5 +1,6 @@
 using System;
 using System.ComponentModel;
+using System.Reactive.Linq;
 using System.Windows;
 using System.Windows.Media.Animation;
 using TogglDesktop.Diagnostics;
@@ -30,15 +31,13 @@ public EditViewPopup()
             this.MinWidth = this.EditView.MinWidth + 16;
             this.mainGrid.Width = 0;
 
-            Toggl.OnTimeEntryEditor += this.onTimeEntryEditor;
-
+            Toggl.OnTimeEntryEditor.ObserveOnDispatcher().Subscribe(this.onTimeEntryEditor);
             KeyboardShortcuts.RegisterShortcuts(this);
         }
 
-        private void onTimeEntryEditor(bool open, Toggl.TogglTimeEntryView te, string focusedFieldName)
+        private void onTimeEntryEditor((bool open, Toggl.TogglTimeEntryView te, string focusedFieldName) x)
         {
-            if (this.TryBeginInvoke(this.onTimeEntryEditor, open, te, focusedFieldName))
-                return;
+            var (open, te, focusedFieldName) = x;
 
             if (!this.Owner.IsVisible)
                 return;
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/IdleNotificationWindow.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/IdleNotificationWindow.xaml.cs
index 586c689d61..371604504f 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/IdleNotificationWindow.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/IdleNotificationWindow.xaml.cs
@@ -1,4 +1,6 @@
 using System;
+using System.Reactive;
+using System.Reactive.Linq;
 using System.Windows;
 using System.Windows.Input;
 using ControlzEx;
@@ -15,14 +17,13 @@ public partial class IdleNotificationWindow
         public IdleNotificationWindow()
         {
             this.InitializeComponent();
-            Toggl.OnIdleNotification += this.onIdleNotification;
-            Toggl.OnStoppedTimerState += this.onStoppedTimerState;
+            Toggl.OnIdleNotification.ObserveOnDispatcher().Subscribe(this.onIdleNotification);
+            Toggl.OnStoppedTimerState.ObserveOnDispatcher().Subscribe(this.onStoppedTimerState);
         }
 
-        private void onIdleNotification(string guid, string since, string duration, long started, string description)
+        private void onIdleNotification((string guid, string since, string duration, long started, string description) x)
         {
-            if (this.TryBeginInvoke(this.onIdleNotification, guid, since, duration, started, description))
-                return;
+            var (guid, since, duration, started, description) = x;
 
             this.guid = guid;
             this.started = started;
@@ -43,11 +44,8 @@ protected override void OnDeactivated(EventArgs e)
             this.Activate();
         }
 
-        private void onStoppedTimerState()
+        private void onStoppedTimerState(Unit _)
         {
-            if (this.TryBeginInvoke(this.onStoppedTimerState))
-                return;
-
             if (this.IsVisible)
             {
                 this.Hide();
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/MainWindow.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/MainWindow.xaml.cs
index 60e165bf90..9332c08156 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/MainWindow.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/MainWindow.xaml.cs
@@ -5,6 +5,7 @@
 using System.Drawing;
 using System.IO;
 using System.Linq;
+using System.Reactive.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Windows;
@@ -234,19 +235,20 @@ private void initializeColorScheme()
 
         private void initializeEvents()
         {
-            Toggl.OnApp += this.onApp;
-            Toggl.OnOverlay += this.onOverlay;
-            Toggl.OnError += this.onError;
-            Toggl.OnLogin += this.onLogin;
-            Toggl.OnTimeEntryEditor += this.onTimeEntryEditor;
-            Toggl.OnTimeEntryList += this.onTimeEntryList;
-            Toggl.OnOnlineState += this.onOnlineState;
-            Toggl.OnURL += this.onURL;
+            Toggl.OnApp.Where(show => show).ObserveOnDispatcher().Subscribe(_ => this.Show());
+            Toggl.OnOverlay.ObserveOnDispatcher().Subscribe(this.onOverlay);
+            Toggl.OnError.ObserveOnDispatcher().Subscribe(this.onError);
+            Toggl.OnLogin.ObserveOnDispatcher().Subscribe(x => this.onLogin(x.open, x.userId));
+            Toggl.OnTimeEntryEditor.Select(x => x.open).ObserveOnDispatcher().Subscribe(this.onTimeEntryEditor);
+            Toggl.OnTimeEntryList.ObserveOnDispatcher().Subscribe(this.onTimeEntryList);
+            Toggl.OnOnlineState.ObserveOnDispatcher()
+                .Subscribe(state => this.updateStatusIcons(state == Toggl.OnlineState.Online));
+            Toggl.OnURL.Subscribe(this.onURL);
             Toggl.OnUserTimeEntryStart += this.onUserTimeEntryStart;
-            Toggl.OnRunningTimerState += this.onRunningTimerState;
-            Toggl.OnStoppedTimerState += this.onStoppedTimerState;
-            Toggl.OnSettings += this.onSettings;
-            Toggl.OnDisplayInAppNotification += this.onDisplayInAppNotification;
+            Toggl.OnRunningTimerState.ObserveOnDispatcher().Subscribe(this.setIsTracking);
+            Toggl.OnStoppedTimerState.ObserveOnDispatcher().Subscribe(_ => this.setIsNotTracking());
+            Toggl.OnSettings.ObserveOnDispatcher().Subscribe(this.onSettings);
+            Toggl.OnDisplayInAppNotification.ObserveOnDispatcher().Subscribe(this.onDisplayInAppNotification);
         }
 
         private void finalInitialisation()
@@ -290,35 +292,15 @@ private void trackingWindowSize()
 
         #region toggl events
 
-        private void onTimeEntryEditor(bool open, Toggl.TogglTimeEntryView te, string focusedFieldName)
+        private void onTimeEntryEditor(bool open)
         {
-            if (this.TryBeginInvoke(this.onTimeEntryEditor, open, te, focusedFieldName))
-                return;
-
             this.updateEditPopupLocation(true);
-
             if (open)
             {
                 this.Show();
             }
         }
 
-        private void onStoppedTimerState()
-        {
-            if (this.TryBeginInvoke(this.onStoppedTimerState))
-                return;
-
-            this.updateTracking(null);
-        }
-
-        private void onRunningTimerState(Toggl.TogglTimeEntryView te)
-        {
-            if (this.TryBeginInvoke(this.onRunningTimerState, te))
-                return;
-
-            this.updateTracking(te);
-        }
-
         private void onUserTimeEntryStart()
         {
             this.taskbarIcon.CloseBalloon();
@@ -339,41 +321,23 @@ private void onURL(string url)
             }
         }
 
-        private void onOnlineState(Toggl.OnlineState state)
+        private void onTimeEntryList((bool, List<Toggl.TogglTimeEntryView>, bool) x)
         {
-            if (this.TryBeginInvoke(this.onOnlineState, state))
-                return;
-
-            this.updateStatusIcons(state == Toggl.OnlineState.Online);
-        }
-
-        private void onTimeEntryList(bool open, List<Toggl.TogglTimeEntryView> list, bool showLoadMoreButton)
-        {
-            if (this.TryBeginInvoke(this.onTimeEntryList, open, list, showLoadMoreButton))
-                return;
-
+            var (open, list, _) = x;
             if (open)
             {
                 this.errorBar.Hide();
                 this.setActiveView(this.timerEntryListView);
             }
 
-            // Get Today's total duration
-            var i = 0;
-            for (; i < list.Count; i++)
-            {
-                if (list[i].DateHeader == "Today") {
-                    this.trayToolTip.TotalToday = list[i].DateDuration;
-                    return;
-                }
-            }
+            this.trayToolTip.TotalToday =
+                list.Where(x => x.DateHeader == "Today")
+                    .Select(x => x.DateDuration)
+                    .FirstOrDefault() ?? "0 h 0 min";
         }
 
         private void onLogin(bool open, ulong userID)
         {
-            if (this.TryBeginInvoke(this.onLogin, open, userID))
-                return;
-
             if (open)
             {
                 this.setActiveView(this.loginView);
@@ -393,58 +357,36 @@ private void onLogin(bool open, ulong userID)
                 this.taskbarIcon.ToolTipText = $"Toggl - Logged in as {Toggl.UserEmail()}";
             }
 
-            this.updateTracking(null);
+            this.setIsNotTracking();
         }
 
         private void onOverlay(long type)
         {
-
-            if (this.TryBeginInvoke(this.onOverlay, type))
-                return;
-
             this.overlayView.setType((int)type);
             this.setActiveView(this.overlayView);
         }
 
-        private void onError(string errmsg, bool userError)
+        private void onError((string, bool) tuple)
         {
-            if (this.TryBeginInvoke(this.onError, errmsg, userError))
-                return;
-
-            if (this.activeView?.HandlesError(errmsg) != true)
+            var (errorMessage, _) = tuple;
+            if (this.activeView?.HandlesError(errorMessage) != true)
             {
-                this.errorBar.ShowError(errmsg);
-            }
-        }
-
-        private void onApp(bool open)
-        {
-            if (this.TryBeginInvoke(this.onApp, open))
-                return;
-
-            if (open)
-            {
-                this.Show();
+                this.errorBar.ShowError(errorMessage);
             }
         }
 
-        private void onSettings(bool open, Toggl.TogglSettingsView settings)
+        private void onSettings((bool, Toggl.TogglSettingsView settings) x)
         {
-            if (this.TryBeginInvoke(this.onSettings, open, settings))
-                return;
-
-            Theme.SetThemeFromSettings(settings.ColorTheme);
+            Theme.SetThemeFromSettings(x.settings.ColorTheme);
             this.setGlobalShortcutsFromSettings();
-            this.idleDetectionTimer.IsEnabled = settings.UseIdleDetection;
-            this.Topmost = settings.OnTop;
-            this.SetManualMode(settings.ManualMode, true);
+            this.idleDetectionTimer.IsEnabled = x.settings.UseIdleDetection;
+            this.Topmost = x.settings.OnTop;
+            this.SetManualMode(x.settings.ManualMode, true);
         }
 
-        private void onDisplayInAppNotification(string title, string text, string button, string url)
+        private void onDisplayInAppNotification((string title, string text, string button, string url) x)
         {
-            if (this.TryBeginInvoke(this.onDisplayInAppNotification, title, text, button, url))
-                return;
-
+            var (title, text, button, url) = x;
             if (inAppNotification == null)
             {
                 inAppNotification = new InAppNotification
@@ -758,32 +700,30 @@ private void updateStatusIcons(bool isOnline)
             this.taskbarIcon.Icon = new Icon(icon, SystemInformation.SmallIconSize);
         }
 
-        private void updateTracking(Toggl.TogglTimeEntryView? timeEntry)
+        private void setIsTracking(Toggl.TogglTimeEntryView timeEntry)
         {
-            var tracking = timeEntry != null;
+            this.IsTracking = true;
+            this.trayToolTip.IsTracking = true;
+            this.trayToolTip.TimeEntryLabel = timeEntry.ToTrayToolTipTimeEntryLabelViewModel();
+            this.trayToolTip.SetDuration(timeEntry);
 
-            this.IsTracking = tracking;
-            this.trayToolTip.IsTracking = tracking;
+            var description = timeEntry.Description;
+            this.Title = string.IsNullOrEmpty(description)
+                ? "Toggl Desktop"
+                : description + " - Toggl Desktop";
 
-            if (tracking)
-            {
-                this.trayToolTip.TimeEntryLabel = timeEntry.Value.ToTrayToolTipTimeEntryLabelViewModel();
-                this.trayToolTip.SetDuration(timeEntry.Value);
-
-                var description = timeEntry.Value.Description;
+            if (this.IsInManualMode)
+                this.SetManualMode(false);
 
-                this.Title = string.IsNullOrEmpty(description)
-                    ? "Toggl Desktop"
-                    : description + " - Toggl Desktop";
+            this.updateStatusIcons(true);
+        }
 
-                if (this.IsInManualMode)
-                    this.SetManualMode(false);
-            }
-            else
-            {
-                this.trayToolTip.TimeEntryLabel = null;
-                this.Title = "Toggl Desktop";
-            }
+        private void setIsNotTracking()
+        {
+            this.IsTracking = false;
+            this.trayToolTip.IsTracking = false;
+            this.trayToolTip.TimeEntryLabel = null;
+            this.Title = "Toggl Desktop";
 
             this.updateStatusIcons(true);
         }
diff --git a/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/PreferencesWindow.xaml.cs b/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/PreferencesWindow.xaml.cs
index 24beabb156..adf7ec9ba4 100644
--- a/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/PreferencesWindow.xaml.cs
+++ b/src/ui/windows/TogglDesktop/TogglDesktop/ui/windows/PreferencesWindow.xaml.cs
@@ -1,6 +1,8 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.ComponentModel;
 using System.Linq;
+using System.Reactive.Linq;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
@@ -36,9 +38,21 @@ public PreferencesWindow()
             this.InitializeComponent();
             ViewModel = new PreferencesWindowViewModel(MessageBox.Show(this), this.Close);
 
-            Toggl.OnSettings += this.onSettings;
-            Toggl.OnLogin += this.onLogin;
-            Toggl.OnProjectAutocomplete += this.onProjectAutocomplete;
+            Toggl.OnSettings.ObserveOnDispatcher().Subscribe(this.onSettings);
+            Toggl.OnLogin
+                .Select(x => !x.open && x.userId != 0)
+                .Select(x => x ? Toggl.IsTimelineRecordingEnabled() : (bool?) null)
+                .ObserveOnDispatcher()
+                .Subscribe(isRecordTimelineEnabled =>
+                {
+                    this.recordTimelineCheckBox.IsEnabled = isRecordTimelineEnabled.HasValue;
+                    this.recordTimelineCheckBox.IsChecked = isRecordTimelineEnabled == true;
+                });
+            Toggl.OnProjectAutocomplete
+                .Do(list => this.knownProjects = list)
+                .Select(AutoCompleteControllers.ForProjects)
+                .ObserveOnDispatcher()
+                .Subscribe(this.defaultProjectAutoComplete.SetController);
 
             this.Closing += OnClosing;
         }
@@ -48,23 +62,12 @@ private void OnClosing(object sender, CancelEventArgs e)
             ViewModel.ResetRecordedShortcuts();
         }
 
-        private void onLogin(bool open, ulong userID)
+        private void onSettings((bool open, Toggl.TogglSettingsView settings) x)
         {
-            if (this.TryBeginInvoke(this.onLogin, open, userID))
-                return;
-
-            this.recordTimelineCheckBox.IsEnabled = !open && userID != 0;
-            this.recordTimelineCheckBox.IsChecked = Toggl.IsTimelineRecordingEnabled();
-        }
-
-        private void onSettings(bool open, Toggl.TogglSettingsView settings)
-        {
-            if (this.TryBeginInvoke(this.onSettings, open, settings))
-                return;
-
             if (this.isSaving)
                 return;
 
+            var (open, settings) = x;
             using (Performance.Measure("filling settings from OnSettings"))
             {
                 this.updateUI(settings);
@@ -77,16 +80,6 @@ private void onSettings(bool open, Toggl.TogglSettingsView settings)
                 this.Activate();
             }
         }
-        private void onProjectAutocomplete(List<Toggl.TogglAutocompleteView> list)
-        {
-            if (this.TryBeginInvoke(this.onProjectAutocomplete, list))
-                return;
-
-            this.knownProjects = list;
-
-            this.defaultProjectAutoComplete.SetController(AutoCompleteControllers.ForProjects(list));
-        }
-
 
         private void updateUI(Toggl.TogglSettingsView settings)
         {