The parent window keeps track of whether the item has child items.
父窗口保留有该项是否包含子项的记录。
The width is the same as the width of the parent window client area.
工具条的宽度与其父窗口的客户区相等。
The system maintains an internal list that contains the child controls associated with a parent window.
系统维护包含与父窗口关联的子控件的内部列表。
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