测量所有子物件之后，排列或定位内容。

Content is arranged, or positioned, after all child objects have been measured.

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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.

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具有键盘焦点的物件不是使用中视窗就是使用中视窗的子物件。

The object with the keyboard focus is either the active window or a child object of the active window.

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