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This code works (when ControlType="dropDown" then the background yellow ): <Window x:Class="TestCollapsed.Views.MainView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:c="clr-namespace:TestCollapsed.Commands" Title="Main Window" Height="400" Width="800"> <Window.Resources> <Style x:Key="DropDownStyle" TargetType="TextBlock"> <Style.Triggers> <DataTrigger Binding="{Binding ControlType}" Value="dropDown"> <Setter Property="Background" Value="Yellow"/> </DataTrigger> </Style.Triggers> </Style> </Window.Resources> <StackPanel> <TextBlock Visibility="Visible" Text="This is going to be the dropdown control." Style="{StaticResource DropDownStyle}"/> </StackPanel> </Window> But this code does not work (when ControlType="dropDown" then the TextBlock is still invisible ): <Window x:Class="TestCollapsed.Views.MainView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:c="clr-namespace:TestCollapsed.Commands" Title="Main Window" Height="400" Width="800"> <Window.Resources> <Style x:Key="DropDownStyle" TargetType="TextBlock"> <Style.Triggers> <DataTrigger Binding="{Binding ControlType}" Value="dropDown"> <Setter Property="Visibility" Value="Visible"/> </DataTrigger> </Style.Triggers> </Style> </Window.Resources> <StackPanel> <TextBlock Visibility="Collapsed"

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