为此，我们为每一类型控件使用了一组注册函数：按钮、标签等等。
For this we use a set of register functions for each type of widget: buttons, labels, and so on.
我上面概述的这些类型的内容定制场景不仅对按钮控件有效，同样地对其他继承自ContentControl基类的其他控件也工作。
These types of content customization scenarios I outlined above work not just for Button controls, but likewise for all other controls that derive from the ContentControl base class.
在网页上充当按钮控件的类中实现此接口。
Implement this interface in classes that act like button controls on Web pages.
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