好的，那有什么问题？不要显示此消息框。相反，只需要一个布尔标志 modified ，然后静默地将其设置为true。稍后，当用户更改选项卡时，请检查此标志并进行相应处理。

-SA

Okay, so what's the problem? Don't show this message box. Instead, just have a Boolean flag modified and set it to true instead, silently. Later on, when the user changes the tab, check up this flag and process accordingly.

—SA

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