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Animating Gradient Offset

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Animation">     <Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">       <Button Padding="30">         OK         <Button.Background>           <LinearGradientBrush>             <GradientStop Color="Blue" Offset="0"/>             <GradientStop Color="Red" Offset="1"/>           </LinearGradientBrush>         </Button.Background>         <Button.Triggers>           <EventTrigger RoutedEvent="Button.Loaded">             <EventTrigger.Actions>               <BeginStoryboard>                 <Storyboard TargetProperty="Background.GradientStops[1].Offset">                   <DoubleAnimation From="0" To="1" Duration="0:0:2"                   AutoReverse="True" RepeatBehavior="Forever"/>                 </Storyboard>               </BeginStoryboard>                  </EventTrigger.Actions>           </EventTrigger>         </Button.Triggers>       </Button>     </Canvas> </Window>