We can confirm that there is an bug related to the selected tab item popup when the RadRibbonView is minimized. I have isolated that problem regardless of the binding to the IsMinimized or SelectedItem properties.
Could you please try to reproduce the issue using the following steps and let us know if that is the issue you are experiencing:
1) Remove the binding to the SelectedItem and IsMinimized. Set the IsMinimized property to true in xaml and run your project.
2) Hover one of the TabItems and single click the item on its bottom border.
3) Now you can move your window and the popup will remain open(displayed as detached to the window).
If that is not the issue, could you give us more detailed steps in order to reproduce it on our side.
Thank you for your cooperation.
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