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void CxxxxDlg::OnNcPaint()
{
// TODO: Add your message handler code here
CDialog::OnNcPaint();
CRect rc;
GetWindowRect(&rc);
rc.OffsetRect(-rc.left,-rc.top);
CDC* pWinDC = GetWindowDC();
CBrush br;
br.Attach(GetStockObject(LTGRAY_BRUSH));
// or: br.CreateSolidBrush(RGB(255,0,0));
// 3 times
pWinDC->FrameRect(&rc,&br);
rc.DeflateRect(1,1);
pWinDC->FrameRect(&rc,&br);
rc.DeflateRect(1,1);
pWinDC->FrameRect(&rc,&br);
ReleaseDC(pWinDC);
// Do not call CDialog::OnNcPaint() for painting messages
}