Changing the behavior of the predefined window classes
Override the window procedure
PLI
dcl pp PFNWP ;
pp = WinSubclassWindow( WinWindowFromID( hwndFrame, FID_SYSMENU ), MenuWndProc ) ;
C
PFNWP pp ;
pp = WinSubclassWindow( WinWindowFromID( hwndFrame, FID_SYSMENU ), MenuWndProc ) ;