This event only occurs when a menu item has submenu items to display.
该事件仅在菜单项有要显示的子菜单项时发生。
However, menu items in the same submenu should not have identical access keys.
不过，同一子功能表中的功能表项目不得有相同的便捷键。
However, menu items in the same submenu should not have identical access keys.
不过，同一子功能表中的功能表项目不得有相同的便捷键。
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