I want to create a extendable application UI like the TabbedView Sample. In which I can attach any window object to a tabcontrol,such as CView object,CHtmlView Object, CFormView object , FrameWnd Object etc. Let's pretend we don't know what exactly the object's class,we just know it's  CWnd-based, so if the object is FrameWnd-based, we should splitter it by a CSplitterWnd member. How to do that ? I mean how to add a splittered Frame to a tabcontrol? It seems hard.

This problem has been resolved.

By default , a CView-based class generated by MFC has a protected constructor, 
when using CRuntimeClass::CreateObject() to creating an instance of such class, return value is null.  Just define the constructor as a public one CSplitterWnd::AddView will return OK.