增加WM_ACAD_KEEPFOCUS消息的响应函数
afx_msg LONG onAcadKeepFocus( UINT, LONG );
BEGIN_MESSAGE_MAP(CPlotSingleDlg, CAcUiDialog)
ON_MESSAGE( WM_ACAD_KEEPFOCUS, onAcadKeepFocus )
END_MESSAGE_MAP()
LONG CPlotSingleDlg::onAcadKeepFocus( UINT, LONG )
{
return TRUE;
}
原文：http://blog.csdn.net/he_zhidan/article/details/42076337