#include <ActiveQt/QAxWidget>
    #include <ActiveQt/QAxObject>
    TestQt2::TestQt2(QWidget *parent, Qt::WFlags flags)
        : QMainWindow(parent, flags)
    {

         QAxObject object("{4FF8F5E1-8D85-45CC-B58E-BE1CF4A5C3EC}");

        object.dynamicCall("IniSet(const QString&)", "EnableUndo=Y");
        ui.setupUi(this);
    }

                IMxDrawApplicationPtr getApplication;
                getApplication.CreateInstance(__uuidof(MxDrawApplication));
                IMxDrawApplication *pApplication = getApplication;
                pApplication->Iniset(_bstr_t("EnableUndo=Y"));

     static void Main()
   {
       MxDrawApplication app = new MxDrawApplication();
     app.Iniset("FireCreateEvent=Y");
     ...
       private void axMxDrawX1_CustomEvent(object sender, AxMxDrawXLib._DMxDrawXEvents_CustomEventEvent e)
       {
   
        if (e.sEventName == "Mx_startCreateMxDraw")
        {
            axMxDrawX1.EnableUndo = true;
        }
       }