private void axMxDrawX1_CustomEvent_1(object sender, AxMxDrawXLib._DMxDrawXEvents_CustomEventEvent e)
    {
        if (e.sEventName == "Mx_NewAddLayer")
        {
            // 得到新增加的层对象id.
            MxDrawResbuf param = (MxDrawResbuf)axMxDrawX1.CustomEventParam();
            for (int i = 0; i < param.Count; i++)
            {
                Int64 id = param.AtObjectId(i);
            }
        }
    }