changing background color of togglebutton when checked

Question

I am trying the distinguish the state of the toggle button when clicked. I have the snippet below

<Window x:Class="WpfApplication2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <Style x:Key="OnOffToggleImageStyle" TargetType="ToggleButton">
            <Style.Triggers>
                <Trigger Property="IsChecked" Value="True">
                    <Setter Property="Background" Value="DimGray"/>
                </Trigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <Grid>
        <ToggleButton Height="60" Content="Text" Style="{StaticResource OnOffToggleImageStyle}">
        </ToggleButton>
    </Grid>
</Window>

However this does not work when IsChecked value is set to "True" in the style. When set to false it works.

I wonder why. Any answers!

Answer 1

When running your code sample, it appears the style is conflicting with the 'chrome' of the ToggleButton (i.e. the original style of the button).

It would probably be better in this situation to override the template of the ToggleButton to behave in the manner you desire. An ugly example can be found below:

<Style x:Key="myToggleButton" TargetType="{x:Type ToggleButton}">
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate>
        <Border x:Name="outer"
        BorderBrush="White"
        BorderThickness="2"
        Opacity=".9"
        Background="Transparent">
          <Border x:Name="inner"
          Margin="8"
          BorderThickness="0"
          Background="{
            Binding Background, 
            RelativeSource={RelativeSource TemplatedParent}}">
            <Grid x:Name="container">
              <Grid.RowDefinitions>
                <RowDefinition Height="2*"/>
                <RowDefinition/>
              </Grid.RowDefinitions>
              <TextBlock x:Name="display"
              Grid.Row="1"
              Text="{Binding Content, RelativeSource={
                RelativeSource TemplatedParent}}"
              Foreground="White"
              FontSize="11"
              FontFamily="Segoe UI"
              FontStyle="Normal"
              FontWeight="Normal"
              Margin="8,0,0,4"
              HorizontalAlignment="Left"
              VerticalAlignment="Bottom"/>
            </Grid>
          </Border>
        </Border>
        <ControlTemplate.Triggers>
          <Trigger Property="ToggleButton.IsChecked" Value="True">
            <Setter TargetName="outer" Property="Background" Value="LightBlue"/>
            <Setter TargetName="outer" Property="BorderBrush" Value="Transparent"/>
          </Trigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>