Button Rounded Corners and Disabled Trigger not working

Question

I have a UserControl Style for my buttons.

<Style TargetType="Button" x:Key="RoundButton">
    <Style.Resources>
        <Style TargetType="Border">
            <Setter Property="CornerRadius" Value="3" />
        </Style>
    </Style.Resources>
    <Style.Triggers>
        <Trigger Property="IsEnabled" Value="False">
            <Setter Property="Background" Value="Red"/>
        </Trigger>
    </Style.Triggers>
</Style>

The rounded corners work, but when the Button is disabled the color does not change.

<Button Width="140" Style="{DynamicResource RoundButton}"
        Command="{Binding SaveCommand}" IsEnabled="{Binding HasUnsavedOdpChanges}"
        HorizontalContentAlignment="Left">

Any suggestions?

Answer 1

The trigger for IsEnabled does not work, because the tigger in the default Button template takes precedence over your custom style. You have to copy the default style and adapt it instead, e.g.:

<Style x:Key="FocusVisual">
   <Setter Property="Control.Template">
      <Setter.Value>
         <ControlTemplate>
            <Rectangle Margin="2" StrokeDashArray="1 2" SnapsToDevicePixels="true" StrokeThickness="1" Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
         </ControlTemplate>
      </Setter.Value>
   </Setter>
</Style>
<SolidColorBrush x:Key="Button.Static.Background" Color="#FFDDDDDD"/>
<SolidColorBrush x:Key="Button.Static.Border" Color="#FF707070"/>
<SolidColorBrush x:Key="Button.MouseOver.Background" Color="#FFBEE6FD"/>
<SolidColorBrush x:Key="Button.MouseOver.Border" Color="#FF3C7FB1"/>
<SolidColorBrush x:Key="Button.Pressed.Background" Color="#FFC4E5F6"/>
<SolidColorBrush x:Key="Button.Pressed.Border" Color="#FF2C628B"/>
<SolidColorBrush x:Key="Button.Disabled.Background" Color="Red"/>
<SolidColorBrush x:Key="Button.Disabled.Border" Color="#FFADB2B5"/>
<SolidColorBrush x:Key="Button.Disabled.Foreground" Color="#FF838383"/>
<Style x:Key="RoundButton" TargetType="{x:Type Button}">
   <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisual}"/>
   <Setter Property="Background" Value="{StaticResource Button.Static.Background}"/>
   <Setter Property="BorderBrush" Value="{StaticResource Button.Static.Border}"/>
   <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
   <Setter Property="BorderThickness" Value="1"/>
   <Setter Property="HorizontalContentAlignment" Value="Center"/>
   <Setter Property="VerticalContentAlignment" Value="Center"/>
   <Setter Property="Padding" Value="1"/>
   <Setter Property="Template">
      <Setter.Value>
         <ControlTemplate TargetType="{x:Type Button}">
            <Border x:Name="border" CornerRadius="3" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" SnapsToDevicePixels="true">
               <ContentPresenter x:Name="contentPresenter" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
            </Border>
            <ControlTemplate.Triggers>
               <Trigger Property="IsDefaulted" Value="true">
                  <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
               </Trigger>
               <Trigger Property="IsMouseOver" Value="true">
                  <Setter Property="Background" TargetName="border" Value="{StaticResource Button.MouseOver.Background}"/>
                  <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.MouseOver.Border}"/>
               </Trigger>
               <Trigger Property="IsPressed" Value="true">
                  <Setter Property="Background" TargetName="border" Value="{StaticResource Button.Pressed.Background}"/>
                  <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.Pressed.Border}"/>
               </Trigger>
               <Trigger Property="IsEnabled" Value="false">
                  <Setter Property="Background" TargetName="border" Value="{StaticResource Button.Disabled.Background}"/>
                  <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.Disabled.Border}"/>
                  <Setter Property="TextElement.Foreground" TargetName="contentPresenter" Value="{StaticResource Button.Disabled.Foreground}"/>
               </Trigger>
            </ControlTemplate.Triggers>
         </ControlTemplate>
      </Setter.Value>
   </Setter>
</Style>