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.
公开方法与属性，以支援UI自动化用户端存取做为子物件集合之可卷动容器的控制项。
Exposes methods and properties to support UI Automation client access to controls that act as containers for a collection of individual, selectable child items.
集合物件已经达成它的最大大小，而且你正在尝试增加另外的一个元件（物件单位） 。
The collection has reached its maximal size, and you are trying to add another element (objects unit).
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