Compared to a true property changed event, using a property trigger to act on a property change has some limitations.
相较于真正的属性变更事件，使用属性触发程序对属性变更采取动作有一些限制。
The property provided by the extender provider actually resides in the extender provider object itself and therefore is not a true property of the component it modifies.
扩展程序提供程序提供的属性实际驻留在扩展程序提供程序对象本身，因此并不是它修改的组件的真正属性。
The property provided by the extender provider actually resides in the extender provider object itself and therefore is not a true property of the component it modifies.
扩展程序提供程序提供的属性实际驻留在扩展程序提供程序对象本身，因此并不是它修改的组件的真正属性。
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