owned d window 附属窗口
If you close an owner window, its owned Windows are also closed.
如果您关闭主控视窗，其附属视窗也会一并关闭。
If an owner window is minimized, all its owned Windows are minimized as well.
如果主控视窗最小化，其所有附属视窗也会一并最小化。
If an owner window is maximized, both the owner window and its owned Windows are restored.
如果主控视窗最大化，则主控视窗与其所有附属视窗会一并还原。
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