快捷菜单界面是页面的一部分，并且属于页面控件树中的一员。
The context menu's UI is part of the page and takes up space in the page's control tree.
换句话说，您必须使用FindControl来访问控件树。
In other words, you would have to access the control tree using FindControl.
当该页发回服务器时，服务器可以分析、验证、并将此视图状态数据应用回该页的控件树。
When the page is posted back to the server, the server can parse, validate, and apply this view state data back to the page's tree of controls.
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