如何在Microsoft Office Word中添加菜单项

我试图根据这篇文章在Microsoft Word中创建一个右键单击菜单项。

这是我的代码：

    private void ThisAddIn_Startup(object sender, System.EventArgs e)
    {
        try
        {
            eventHandler = new _CommandBarButtonEvents_ClickEventHandler(MyButton_Click);
            Word.Application applicationObject = Globals.ThisAddIn.Application as Word.Application;
            applicationObject.WindowBeforeRightClick += new Microsoft.Office.Interop.Word.ApplicationEvents4_WindowBeforeRightClickEventHandler(App_WindowBeforeRightClick);
        }
        catch (Exception exception)
        {
            MessageBox.Show("Error: " + exception.Message);
        }
    }

    void App_WindowBeforeRightClick(Microsoft.Office.Interop.Word.Selection Sel, ref bool Cancel)
    {
        try
        {
            this.AddItem();
        }
        catch (Exception exception)
        {
            MessageBox.Show("Error: " + exception.Message);
        }

    }
    private void AddItem()
    {
        Word.Application applicationObject = Globals.ThisAddIn.Application as Word.Application;
        CommandBarButton commandBarButton = applicationObject.CommandBars.FindControl(MsoControlType.msoControlButton, missing, "HELLO_TAG", missing) as CommandBarButton;
        if (commandBarButton != null)
        {
            System.Diagnostics.Debug.WriteLine("Found button, attaching handler");
            commandBarButton.Click += eventHandler;
            return;
        }
        CommandBar popupCommandBar = applicationObject.CommandBars["Text"];
        bool isFound = false;
        foreach (object _object in popupCommandBar.Controls)
        {
            CommandBarButton _commandBarButton = _object as CommandBarButton;
            if (_commandBarButton == null) continue;
            if (_commandBarButton.Tag.Equals("HELLO_TAG"))
            {
                isFound = true;
                System.Diagnostics.Debug.WriteLine("Found existing button. Will attach a handler.");
                commandBarButton.Click += eventHandler;
                break;
            }
        }
        if (!isFound)
        {
            commandBarButton = (CommandBarButton)popupCommandBar.Controls.Add(MsoControlType.msoControlButton, missing, missing, missing, true);
            System.Diagnostics.Debug.WriteLine("Created new button, adding handler");
            commandBarButton.Click += eventHandler;
            commandBarButton.Caption = "h5";
            commandBarButton.FaceId = 356;
            commandBarButton.Tag = "HELLO_TAG";
            commandBarButton.BeginGroup = true;
        }
    }

    private void RemoveItem()
    {
        Word.Application applicationObject = Globals.ThisAddIn.Application as Word.Application;
        CommandBar popupCommandBar = applicationObject.CommandBars["Text"];
        foreach (object _object in popupCommandBar.Controls)
        {
            CommandBarButton commandBarButton = _object as CommandBarButton;
            if (commandBarButton == null) continue;
            if (commandBarButton.Tag.Equals("HELLO_TAG"))
            {
                popupCommandBar.Reset();
            }
        }
    }
    private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
    {
        Word.Application App = Globals.ThisAddIn.Application as Word.Application;
        App.WindowBeforeRightClick -= new Microsoft.Office.Interop.Word.ApplicationEvents4_WindowBeforeRightClickEventHandler(App_WindowBeforeRightClick);

    }

    #region VSTO generated code

    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InternalStartup()
    {
        this.Startup += new System.EventHandler(ThisAddIn_Startup);
        this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
    }
    #endregion
    //Event Handler for the button click

    private void MyButton_Click(CommandBarButton cmdBarbutton, ref bool cancel)
    {
        System.Windows.Forms.MessageBox.Show("Hello !!! Happy Programming", "l19 !!!");
        RemoveItem();
    }
}

}

当我右键单击一个字母时的结果：

但是用桌子我做不到。查看屏幕截图，了解我的意思：

当我右键单击ms word表时，我无法添加项目菜单。请帮我。谢谢！！

对不起我的英语，...