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Animate GeometryDrawing Examples

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   x:Class="Microsoft.Samples.Graphics.AnimateGeometryDrawingExample"    Title="Using a DrawingBrush">   <DockPanel Name="myAnimatedDrawing" Height="400" Width="400">           <DockPanel.Background>             <DrawingBrush  TileMode="FlipXY" Viewport="0,0,100,100" ViewportUnits="Absolute"                Viewbox="0,0,1,1" ViewboxUnits="Absolute">               <DrawingBrush.Drawing>                   <GeometryDrawing >                   <GeometryDrawing.Pen>                     <Pen Brush="Orange" Thickness="0.1" />                   </GeometryDrawing.Pen>                   <GeometryDrawing.Geometry>                                          <EllipseGeometry RadiusX="0.45" RadiusY="0.2" Center="0.5,0.5" />                   </GeometryDrawing.Geometry>                 </GeometryDrawing>               </DrawingBrush.Drawing>             </DrawingBrush>           </DockPanel.Background>   </DockPanel>   <Page.Triggers>     <EventTrigger RoutedEvent="Page.Loaded">       <BeginStoryboard>         <Storyboard>           <DoubleAnimation              Storyboard.TargetName="myAnimatedDrawing"              Storyboard.TargetProperty="(DockPanel.Background).(DrawingBrush.Drawing).(GeometryDrawing.Geometry).(EllipseGeometry.RadiusX)"             From="0.01" To="0.5" Duration="0:0:10" AutoReverse="True" RepeatBehavior="Forever" />                  </Storyboard>       </BeginStoryboard>     </EventTrigger>   </Page.Triggers> </Page>