I have TabbedMdiHost element and I dinamically load documentWindows like tabs. Each documentWindow has custom number of userControls from database. The problem is, that layout on the unactive tabs is updated only when I selecet a documentWindow. So when I select first documentWindow, I wait untill layout will be updated, then when I select second document window, I wait again and so on for each tab. It happens when I select documentWindow for the first time. When I select for the second time the same window, it's working fine. Is there a way to update layout of all documentWindows at once?