How can I animate a Popup ?

In order to rotate the Popup, this example assigns a RotateTransform to the ‘RenderTransform’ property on the Canvas, which is the child element of the Popup. For the transform to work correctly, the example must set the ‘AllowsTransparency property’ to true. In addition, the Margin on the Canvas content must specify enough space for the Popup to rotate.

[XAML]

<Popup IsOpen='{Binding ElementName=myCheckBox,Path=IsChecked}' 
       PlacementTarget='{Binding ElementName=myCheckBox}'            
       AllowsTransparency='True'
       PopupAnimation='Slide'
       HorizontalOffset='50'
       VerticalOffset='50'
       >
  <!--The Margin set on the Canvas provides the additional 
      area around the Popup so that the Popup is visible when 
      it rotates.-->
  <Canvas Width='100' Height='100' Background='DarkBlue'
          Margin='150'>
    <Canvas.RenderTransform>
      <RotateTransform x:Name='theTransform' />
    </Canvas.RenderTransform>
    <TextBlock TextWrapping='Wrap' Foreground='White'>
      Rotating Popup
    </TextBlock>
  </Canvas>
</Popup>