<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Background="{x:Static SystemColors.WindowBrush}" Name="page"> <Page.Resources> <Style TargetType="{x:Type RadioButton}"> <Setter Property="Margin" Value="6" /> </Style> </Page.Resources> <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" Background="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"> <RadioButton Content="Red"> <RadioButton.Triggers> <EventTrigger RoutedEvent="RadioButton.Checked"> <BeginStoryboard> <Storyboard> <ColorAnimation Storyboard.TargetName="page" Storyboard.TargetProperty="Background.Color" To="Red" Duration="0:0:1" /> </Storyboard> </BeginStoryboard> </EventTrigger> </RadioButton.Triggers> </RadioButton> </StackPanel> </Page>