Sorry for the confusion.
If you test this scenario in the UnpinnedPanes demo, it won't work, as I mentioned earlier there was a bug with the focusing of the RadPane. If you use the latest internal build, if you click on the HostDocument the focus should be lost and the unpinned pane should get hidden.
Are you still experiencing the issue when using the latest internal build? If so, could you please send us a sample project in which we can observe it and steps to reproduce. In that way we will be able to research it and provide a solution.
the Telerik team
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