向选定的类或对象添加消息处理程序，然后以新函数打开文本编辑器，以便可以添加控件通知处理程序代码。

Adds the message handler to the selected class or object, and then opens the text editor to the new function so you can add the control notification handler code.

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为选定类的消息添加或删除指定处理函数。

Allows you to add or delete specified handler functions for the messages provided for the selected class.

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