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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。
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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。
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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。
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