为什么VS2012 重载OnNcHitTest(CPoint point)函数，无法禁止标题栏移动,操作系统WIN7 64位

[qep345]

LRESULT CIRDNewDlg::OnNcHitTest(CPoint point)
{
    UINT nFlag = CDialog::OnNcHitTest(point);
	if (HTCAPTION == nFlag)
	{
		return HTCLIENT;
	}
	return CDialog::OnNcHitTest(point); 
}

[yxz_lp]

UINT nFlag = CDialog::OnNcHitTest(point);
    if (HTCAPTION == nFlag)
    {
        return HTCLIENT;
    }
    return  nFlag ;