SUMMARY
When creating a CMDIChildWnd, the parent of the multiple document
interface (MDI) window is a "MDICLIENT" control. The handle to the
parent frame window can be retrieved in the following way:
hwnd =::GetParent(lpcreatestruct.hwndParent);
Alternatively, use the following
CMDIFrameWnd* pFrame = (CMDIFrameWnd*)GetParentFrame();
to acquire a pointer to the parent MDI frame window object.
NOTE: GetParentFrame is declared to return a pointer to a CFrameWnd
object, and therefore it is necessary to typecast the result to a
CMDIFrameWnd object.