Call this method to create the control window and advise any hosted controls.
virtual HWND CreateControlWindow( 
   HWND hWndParent, 
   RECT& rcPos  
);
Parameters
hWndParent
A handle to the parent window of the control.rcPos
The position rectangle of the composite control in client coordinates relative to hWndParent.
Return Value
Returns a handle to the newly created composite control dialog box.
Remarks
This method calls CComCompositeControl::Create and CComCompositeControl::AdviseSinkMap.
Requirements
Header: atlcom.h