Animate a RectangleGeometry (inside an Image.Clip) in Windows 8/Metro/Store

Question

I am trying to animate an image Clip that is made using a RectangleGeometry.

However, I can't find any solution to do that. I have already reached the following conclusions:

• Windows metro doesn't support RectAnimation (straight forward solution for this issue)
• Windows metro doesn't support PathGeometry in Cliping (so I could do a workaround)
• Windows metro doesn't have RectAnimationUsingKeyFrames (another solution presented by Microsoft)

Answer 1

I ended up adding adding a Transform in the RectangleGeometry and I animated it:

<!-- In the Clip Section -->
<RectangleGeometry 
    x:Name="RectangleGeometry"  
    Rect="0,0,727,400" >
    <RectangleGeometry.Transform>
         <TranslateTransform x:Name="ClipTransform"/>
    </RectangleGeometry.Transform>
</RectangleGeometry>

<!-- Animate the Clip Section -->
<Storyboard x:Name="Anim">
    <DoubleAnimation 
        Duration="0:0:1" 
        To="-100"
        Storyboard.TargetName="ClipTransform"          
        Storyboard.TargetProperty="Y"  />
</Storyboard>

I don't know if there is a better solution, but this one was the one I found.