Double type의 프로퍼티를 변경하기 위한 애니메이션

<Canvas x:Name="LayoutRoot">
 <Canvas.Resources>
  <Storyboard x:Name="rectAnimation">
   <DoubleAnimation Duration="00:00:01" Storyboard.TargetName="rect" Storyboard.TargetProperty="(Width)" From="100" To="200" />
  </Storyboard>
 </Canvas.Resources>
 <Rectangle x:Name="rect" Fill="Red" Width="100" Height="100" Canvas.Left="100" Canvas.Top="100" />
</Canvas> 

View : http://myifu.com/_study/silverlight/template_animation_08_doubleanimation01/