描述如何实现用户控件和窗体中构成控件的自定义呈现代码。
Describes how to implement custom rendering code for constituent controls in your user controls and forms.
如果要使开发人员得以访问构成控件，则必须将它们声明为公共的，或有选择地公开其属性。
If you want to allow developers to access the constituent controls, you must declare them as public, or selectively expose properties of the constituent control.
它与其父控件拥有相同的构成控件，但除非将构成控件的属性特别公开，否则它们将不可用。
It possesses the same constituent controls as its parent control, but the properties of the constituent controls will not be available unless they were specifically exposed.
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