The framework calls this method when it erases the MDI client area.
virtual BOOL OnEraseMDIClientArea(
   CDC* pDC,
   CRect rectClient
);
Parameters
- [in] pDC 
 A pointer to a device context.
- [in] rectClient 
 A rectangle that specifies the boundaries of the MDI client area.
Return Value
A reserved value. The default implementation returns FALSE.
Remarks
Override this method to execute custom code when the visual manager erases the MDI client area.
Requirements
Header: afxvisualmanager.h