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CBrush brush(RGB (250,250,250));
CBrush* pOldBrush = pDC->SelectObject (&brush);
CRect rcClip;
pDC->GetClipBox(&rcClip);
pDC-> PatBlt(rcClip.left , rcClip.top ,rcClip.Width() , rcClip.Height() ,PATCOPY );
pDC-> SelectObject (pOldBrush );
return TRUE;