C#二次开发的菜单问题

玉壶儿

注册程序大致如下，想请教下，为什么在菜单上选择第二次 或者重新在菜单上选择另一项 UG便会直接崩溃退出！！十分棘手啊！！

            NXOpen.UF.UFMb.Action[] uaActions = new NXOpen.UF.UFMb.Action[7];

            uaActions[0].action_name = "ABOUT";
            uaActions[0].action_cb.cb = new UFMb.CallbackT(ABOUT);

            uaActions[1].action_name = "CONFIGURATION";
            uaActions[1].action_cb.cb = new UFMb.CallbackT(CONFIGURATION);

            uaActions[2].action_name = "CREATE_PART_CODE";
            uaActions[2].action_cb.cb = new UFMb.CallbackT(CREATE_PART_CODE);

            uaActions[3].action_name = "NEW_PART";
            uaActions[3].action_cb.cb = new UFMb.CallbackT(NEW_PART);

            uaActions[4].action_name = "DEL_PART";
            uaActions[4].action_cb.cb = new UFMb.CallbackT(DEL_PART);

            uaActions[5].action_name = "OPEN_PART";
            uaActions[5].action_cb.cb = new UFMb.CallbackT(OPEN_PART);

            uaActions[6].action_name = null;
            uaActions[6].action_cb = new NXOpen.UF.UFMb.Cb();
            uaActions[6].action_cb.cb = null;
            uaActions[6].action_cb.cb_data = System.IntPtr.Zero;

            ufs.Mb.AddActions(uaActions);

--------------------------------------------------------------
    static NXOpen.UF.UFMb.CbStatus ABOUT(IntPtr w, IntPtr client_data, IntPtr button)
    {
        Class.Class1.About();
        return UFMb.CbStatus.CbContinue;
    }

    static NXOpen.UF.UFMb.CbStatus CONFIGURATION(IntPtr w, IntPtr client_data, IntPtr button)
    {
        Class.Class1.thedialog();
        return UFMb.CbStatus.CbContinue;
    }

    static NXOpen.UF.UFMb.CbStatus CREATE_PART_CODE(IntPtr w, IntPtr client_data, IntPtr button)
    {

        Class.Class1.theCreatPartCode();
        return UFMb.CbStatus.CbContinue;
    }

    static NXOpen.UF.UFMb.CbStatus NEW_PART(IntPtr w, IntPtr client_data, IntPtr button)
    {

        Class.Class1.prt_new();
        return UFMb.CbStatus.CbContinue;
    }

    static NXOpen.UF.UFMb.CbStatus DEL_PART(IntPtr w, IntPtr client_data, IntPtr button)
    {
        Class.Class1.deletePart();
        return UFMb.CbStatus.CbContinue;
    }

    static NXOpen.UF.UFMb.CbStatus OPEN_PART(IntPtr w, IntPtr client_data, IntPtr button)
    {
        Class.Class1.openPart();
        return UFMb.CbStatus.CbContinue;
    }

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