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I looked at the samples such as ProfuiStudio, but I cannot determine how the tab window controls are added. I tried adding a custom control, class name "ProfUIS-TabWindow" but I get an assert error in AfxGetResourceHandle().

You can see this in the ProfUIS_Controls sample. Please open the IDD_PAGE_TAB_WINDOW dialog resource to see how you should initialize the custom control so that it correctly can be used by CExtTabWnd. You should also link the custom control with corresponding class property in the DoDataExchange method:

DDX_Control( pDX, ID_TABCTRL_INNER_TOP, m_wndTabInnerTop );

The other way is to dynamically create the tab window with CExtTabWnd::Create. You can choose either the first or second way.

I got it working, the assert was unrelated to adding the CExtTabWnd.

FYI: to add a CExtTabWnd control to a dialog in the form editor, you add a custom control and change the class to "ProfUIS-TabWindow". Thats how its done.