We were not able to reproduce the described issue. I tested the scenario with the latest version of the controls (Q3 2013 SP 1) with Pane docked inside and outside of the DocumentHost and floating Pane. I'm attaching a video of my tests. Please check it let me know if I am missing anything here, I'll ask you to also share some more information about your setup and the version of the controls you are using.
I'm looking forward to your reply.
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