背景色変更(OnCtrlColor)

HBRUSH CMyWnd::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) 
{
  HBRUSH hbr;
  if (IDC_CTRL != pWnd->GetDlgCtrlID())
  {
    hbr = ::GetSysColorBrush(COLOR_WINDOW);
    pDC->SetBkColor(::GetSysColor(COLOR_WINDOW));
  }
  else
  {
    hbr = CWnd::OnCtlColor(pDC, pWnd, nCtlColor);
  }
  return hbr;
}

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