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Animation LinearGradientBrush

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"       HorizontalAlignment="Stretch" VerticalAlignment="Stretch">     <Ellipse Height="100" Width="200">       <Ellipse.Fill>         <LinearGradientBrush x:Name="gradientBrush" StartPoint="0,0" EndPoint="1,0">           <GradientStop Color="Red" />           <GradientStop Color="Blue" Offset="1" />         </LinearGradientBrush>       </Ellipse.Fill>            <Ellipse.Triggers>         <EventTrigger RoutedEvent="Ellipse.Loaded">           <BeginStoryboard>             <Storyboard>                                      <ColorAnimation Storyboard.TargetName="gradientBrush"                     Storyboard.TargetProperty="(LinearGradientBrush.GradientStops)[1].(GradientStop.Color)"                     To="Green" Duration="0:0:4" />                      </Storyboard>           </BeginStoryboard>         </EventTrigger>       </Ellipse.Triggers>     </Ellipse> </Page>