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Call this member function to retrieve the window's top level frame window, if any.

CFrameWnd* GetTopLevelFrame( ) const;

Identifies the top-level frame window of the window.

The returned pointer may be temporary and should not be stored for later use.

If CWnd has no attached window, or its top-level parent is not a CFrameWnd-derived object, this function returns NULL.

Header: afxwin.h