Animate cancelled drag

[mickeyl]

First, thanks for this great piece of code! It's working wonderfully.
I'm wondering though how to animate a cancelled drag, i.e. a drag where the destination view is not allowed. I'd like to animate the draggingView back to the sourceView, however it seems the framework automagically removes the draggingView on drop – no matter whether it was an allowed or forbidden destinationView. Any idea how to "fix" this?

Thanks,

:M: