We are not aware of such issue. I tried to reproduce the issue with a simple WPF application by clicking on the header of the Window but with no success. We are listening to IsKeyboardFocusWithinChanged
as well as to some mouse events in order to close the Popup.
Could you please provide some more information on your project that could be of help. It will be best if you could send us a code snippet or a sample project that reproduces the issue. This will greatly help us pinpoint he issue.
the Telerik team
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