System.Windows.SystemColorsの使い方

<TextBox Text="ControlLightBrush 型:Brush" Background="{x:Static SystemColors.ControlLightBrush}" />
 
<TextBox Text="ControlLightBrushKey 型:RsourceKey" Background="{DynamicResource {x:Static SystemColors.ControlLightBrushKey}}" />
 
<TextBox Text="ControlLightColor 型:Color">
  <TextBox.Background>
    <LinearGradientBrush>
      <LinearGradientBrush.GradientStops>
        <GradientStop Offset="0.0" Color="White" />
        <GradientStop Offset="1.0" Color="{x:Static SystemColors.ControlLightColor}" />
      </LinearGradientBrush.GradientStops>
    </LinearGradientBrush>
  </TextBox.Background>
</TextBox>
 
<TextBox Text="ControlLightColorKey 型:RsourceKey">
  <TextBox.Background>
    <LinearGradientBrush>
      <LinearGradientBrush.GradientStops>
        <GradientStop Offset="0.0" Color="White" />
        <GradientStop Offset="1.0" Color="{DynamicResource {x:Static SystemColors.ControlLightColorKey}}" />
      </LinearGradientBrush.GradientStops>
    </LinearGradientBrush>
  </TextBox.Background>
</TextBox>