当设计介面上使用主控物件时，就会发生这个情况。
This occurs when the owning object is used on the design surface.
当主控物件执行个体化时，会从字串中转换属性值。
Property values are converted from strings when the owning object is instantiated.
说明主项目和主控制项的功能，包括针对事件进行程序设计、将控制项系结至资料以及控制项与原生物件之间的差异。
Describes the functionality of host items and host controls, including programming against events, binding the controls to data, and how the controls differ from the native objects.
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