将客户区指定区域设置为标题栏(可以拖动)

 UINT nHitTest = CDialogEx::OnNcHitTest(point);
 CRect rect;
 GetClientRect(&rect);
 rect.bottom = 18;
 ScreenToClient(&point);
 if(rect.PtInRect(point))
 {
 　　 if(HTCLIENT == nHitTest)
  　　　　nHitTest = HTCAPTION;
 }