I am not sure that I completely understand your requirement. Can you please tell me what you mean by saying that the RadRibbonGroup is opened on ribbon tab's double click? Furthermore, drawings of the actual and the expected result will be helpful.
Also, you can pin the popup with the content of the selected tab by using the RadRibbonView's IsMinimized property. As for a Click event on the RadRibbonTab control, there is no such event, however, you can use the AddHandler() method of the tab to subscribe for the MouseLeftButtonDown event which might be helpful for your case.
Thank you for any help you can provide.
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