Hi Ludek,
I am adding tabs to the tab control from code behind with the Viewer (also created from code behind) set as the tabs content.
Please do not reply and tell me I am doing this the incorrect way. This has worked since the first release of the WPF viewer and was only broken in SP9 when the developers fixed ADAPT01705270.
The fact the you were able to reproduce these issues easily should be enough to send it back to the developers to fix.
I apologise if I seem annoyed but I have wasted numerous hours testing every release since SP4 only to find that they were broken in ways that made the viewer unusable.
Thanks
Anthony