借由处理逻辑树状结构，传回指定之物件的直接子物件集合。
Returns the collection of immediate child objects of the specified object, by processing the logical tree.
在事件路由堆叠中，新增开始分枝成两个逻辑树状结构的最上层项目。
The source for the top-most element on the event route stack at which two logical trees diverge.
虽然这在大多数情况下并不需要，不过资深控制项作者可选择覆写逻辑树状结构。
Although it is not necessary in most cases, advanced control authors have the option to override the logical tree.
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