#include <windows.h>

extern HWND  hMdiClient ;

BOOL CALLBACK InvalidateProc (HWND hChild, LPARAM lParam) 
{
	InvalidateRect (hChild, NULL, TRUE) ;
	return TRUE ; 
}

void InvalidateAllChildWindows ( ) 
{
	EnumChildWindows (hMdiClient, (WNDENUMPROC)InvalidateProc, 0) ;
}
