I'm adding a tabControl to a grid with

<

igWindows:XamTabControl Grid.Row="0" Name="xamTabControl1" AllowMinimize="False" >

But all the content that I add to my TabItemEx appears to be minimized.  This is both in the designer and at runtime.  Now, I have several XamComboEditor's in the TabItemEx, and if I comment one of them out the designer redraws the window and everything looks fine.  When I run it, however, everything is minimized again.

Replacing the XamTabControl with a plain ol System.Windows.Controls.TabControl corrects the issue entirely.