You may receive a notification in your user control like (Activate or get focus). I'm not sure about this just guessing.
Regards, Artem Taturevych | Snr. Developer | IC3D ANZ
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I've tried every handler that I could for the UserControl and nothing seems to fire when the tab is clicked. I can get the OnFocus when I click on the control itself. Any more suggestions? Additionally, it would be nice to add a context menu on right mouse click on the tab - is that even possible?