Nesting RadDocking Causes Exception

Hello,

I am using version 2011.3.2008.1050 of Telerik controls in Silverlight application.

I stumbled across the nested docking issue when I tried to add a RadDocking inside the parent RadDocking's pane. A build error says nesting RadDocking is not supported in this version. I tried adding the AllowUnsafeMode="True" property which allowed it build successfully. But when I try to  drag the child RadDocking' pane it throws an exception.

I have created a sample to demonstrate the actual problem; please see the attached screenshot of sample and exception. I'll highly appreciate if you can help me resolve this issue.

NOTE: Upgrading the version of the Telerik Controls is not an option for me, please.

Looking forward to hearing from you.

Thanks and Regards,

Arfan