有些简单的控件方法，例如一个应用程序可能在版本更新过程中会变更其用户命令按钮的标签。
The control may be something simple, such as an application that has a user-command button with a label that changes from release to release.
命令按钮需要有命令的名称并且可以在一张页面上建立多个按钮控件。
A command button has a command name and allows you to create multiple button controls on a page.
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