在第2部分中，您创建了视图部件及其对象(如按钮、文本框和表示视图)。

In part 2, you created the view parts and its objects (such as button, text box, and table view).

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这一技术同样应用到了控件上(如按钮)，尽管实际上有一个三状态选择框看起来更有用些。

The same also applies to controls (such as Buttons), although practically the ability to have a three-state checkbox is likely to be more directly useful.

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但是在那些状态会改变的组件中(例如按钮)，可以为每种状态定义完全不同的外观。

But in a component whose state will change — a button, for example — you can define a completely different look for every state.

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