App.xaml

<prism:PrismApplication x:Class="UnitPlanGenerator.App"
                        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
	                    xmlns:prism="http://prismlibrary.com/"
                        xmlns:ui="http://schemas.modernwpf.com/2019"
                        xmlns:converter="clr-namespace:UnitPlanGenerator.Converters"
                        xmlns:templateSelector="clr-namespace:UnitPlanGenerator.TemplateSelectors"
                        xmlns:model="clr-namespace:UnitPlanGenerator.Models"
                        xmlns:sys="clr-namespace:System;assembly=mscorlib"
                        xmlns:local="clr-namespace:UnitPlanGenerator">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ui:ThemeResources />
                <ui:XamlControlsResources />
            </ResourceDictionary.MergedDictionaries>

            <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
            <converter:InverseBooleanConverter x:Key="InverseBooleanConverter" />
            <converter:EqualityToVisibilityConverter x:Key="EqualityToVisibilityConverter" />

            <templateSelector:SubjectTemplateSelector x:Key="SubjectTemplateSelector" />

            <converter:DatabaseProviderToStringConverter x:Key="DatabaseProviderToStringConverter" />
            <ObjectDataProvider x:Key="DatabaseProviderItems"
                                MethodName="GetValues"
                                ObjectType="{x:Type sys:Enum}">
                <ObjectDataProvider.MethodParameters>
                    <x:Type TypeName="model:DatabaseProvider"/>
                </ObjectDataProvider.MethodParameters>
            </ObjectDataProvider>
            <DataTemplate DataType="{x:Type model:DatabaseProvider}">
                <ContentPresenter Content="{Binding Converter={StaticResource DatabaseProviderToStringConverter}}" />
            </DataTemplate>

            <converter:UserRoleToStringConverter x:Key="UserRoleToStringConverter" />
            <DataTemplate DataType="{x:Type model:Role}">
                <ContentPresenter Content="{Binding Converter={StaticResource UserRoleToStringConverter}}" />
            </DataTemplate>

            <converter:SubjectTypeConverter x:Key="SubjectTypeConverter" />
            <ObjectDataProvider x:Key="SubjectTypeItems"
                                MethodName="GetValues"
                                ObjectType="{x:Type sys:Enum}">
                <ObjectDataProvider.MethodParameters>
                    <x:Type TypeName="model:SubjectType"/>
                </ObjectDataProvider.MethodParameters>
            </ObjectDataProvider>
            <DataTemplate DataType="{x:Type model:SubjectType}">
                <ContentPresenter Content="{Binding Converter={StaticResource SubjectTypeConverter}}" />
            </DataTemplate>
            
            <Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource DefaultTextBoxStyle}">
                <Style.Triggers>
                    <Trigger Property="Validation.HasError" Value="False">
                        <Setter Property="ui:ControlHelper.Description"
                                Value=" " />
                    </Trigger>
                    <Trigger Property="Validation.HasError" Value="True">
                        <Setter Property="ui:ControlHelper.Description"
                                Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors)/ErrorContent}" />
                    </Trigger>
                </Style.Triggers>
            </Style>
            
            <Style TargetType="{x:Type PasswordBox}" BasedOn="{StaticResource DefaultPasswordBoxStyle}">
                <Setter Property="Validation.ErrorTemplate" Value="{x:Null}" />
                <Style.Triggers>
                    <Trigger Property="Validation.HasError" Value="False">
                        <Setter Property="ui:ControlHelper.Description"
                                Value=" " />
                    </Trigger>
                    <Trigger Property="Validation.HasError" Value="True">
                        <Setter Property="ui:ControlHelper.Description"
                                Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors)/ErrorContent}" />
                        <Setter Property="BorderBrush" Value="{DynamicResource SystemControlErrorTextForegroundBrush}" />
                        <Setter Property="BorderThickness" Value="{DynamicResource TextControlBorderThemeThicknessFocused}" />
                    </Trigger>
                </Style.Triggers>
            </Style>
        </ResourceDictionary>
    </Application.Resources>
</prism:PrismApplication>