Silverlight Toolkit: Drag & Drop with WrapPanel

Question

Hi, 

we use the Silverlight Toolkit to enable Drag and Drop for our application, but when using a wrappanel it does not work correctly:

I made a short example, with StackPanel it works:

http://gpstudio.de/example/StackPanel/TestPage.html

But when using a WrapPanel for the ListBox, nothing works anymore:

http://gpstudio.de/example/WrapPanel/TestPage.html

Does anybody have an idea?