MainWindow.xaml

<Window x:Class="Timer.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        MouseDown="OnBackgroundClick"
        Title="Таймер"
        Height="450" Width="800">
    
    <Grid>
        <Grid Name="Layout">
            <Grid.Resources>
                <Style TargetType="TextBox">
                    <Setter Property="TextAlignment" Value="Center"/>
                    <Setter Property="BorderThickness" Value="0"/>
                    <Setter Property="VerticalContentAlignment" Value="Center"/>
                    <Setter Property="FontSize" Value="20"/>
                </Style>
                <Style TargetType="TextBlock">
                    <Setter Property="TextAlignment" Value="Center"/>
                    <Setter Property="VerticalAlignment" Value="Center"/>
                    <Setter Property="FontSize" Value="20"/>
                </Style>
                <Style TargetType="Button">
                    <Setter Property="BorderThickness" Value="0"/>
                    <Setter Property="Foreground" Value="Gray"/>
                    <Setter Property="Padding" Value="10"/>
                    <Setter Property="Background" Value="WhiteSmoke"/>
                </Style>
                
            </Grid.Resources>
            <Grid.Effect>
                <BlurEffect Radius="0"/>
            </Grid.Effect>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
                <RowDefinition/>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="Auto"/>
            </Grid.RowDefinitions>
            <TextBox Name="TitleOne" MouseWheel="OnMouseWheelResize"/>
            
            <ProgressBar Name="ProgressBar" Visibility="Hidden" Grid.Row="1" VerticalAlignment="Top"/>
            <StackPanel Grid.Row="1" VerticalAlignment="Top" SizeChanged="OnCurrentTimerSizeChanged">
                <TextBlock Name="TimerOne" Text="Таймер не выбран" MouseWheel="OnMouseWheelResize" FontSize="60"/>
                <TextBlock Name="Title" Margin="0 0 0 10" MouseWheel="OnMouseWheelResize"/>
            </StackPanel>
            <Grid Grid.Row="2">
                <StackPanel Orientation="Horizontal">
                    <Button Content="Добавить" Click="OnClickAddTimer"/>
                    <Button Content="Удалить" Name="RemoveBtn" Visibility="Collapsed" Click="OnClickRemoveSelected"/>
                </StackPanel>
                <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
                    <Button Content="Старт" Name="StartBtn" Click="OnClickStartTimer" Visibility="Collapsed"/>
                    <Button Content="Пауза" Name="PauseBtn" Click="OnClickPauseTimer" Visibility="Collapsed"/>
                    <Button Content="Сброс" Name="DropBtn" Click="OnClickDropTimer" Visibility="Collapsed"/>
                </StackPanel>
                <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
                    <Button Content="Выбрать звук" Name="MusicBtn" Click="OnClickSelectMusic"  Visibility="Collapsed"/>
                    <Button Content="Следующий" Name="NextBtn" Click="OnClickSetupNext" Visibility="Collapsed"/>
                </StackPanel>
            </Grid>
            <ListView Name="List" Grid.Row="3" BorderThickness="0" Padding="0" Margin="0">
                <ListView.Resources>
                    <Style TargetType="ListViewItem">
                        <Setter Property="BorderThickness" Value="0"/>
                        <Setter Property="Margin" Value="0"/>
                        <Setter Property="Padding" Value="0"/>
                    </Style>
                </ListView.Resources>
                <ItemsControl.ItemTemplate>
                    <ItemContainerTemplate>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="{Binding Title}" Margin="4"/>
                            <TextBlock Text="{Binding AsText}" Margin="4"/>
                        </StackPanel>
                    </ItemContainerTemplate>
                </ItemsControl.ItemTemplate>
            </ListView>
        </Grid>
        <ContentControl Name="ModalControl"/>
    </Grid>
</Window>