arx 中对话框无法获得输入焦点的问题

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;
 }