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。
Likewise, disabling a menu item that has submenu items hides the submenu items, but does not disable them.
同样地，停用功能表项目具有子功能表项目就会隐藏子功能表项目，但不停用它们。
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。
It allows you to easily disable unwanted menu items, so this' New 'submenu will display only the items that you need.
它可以让你轻松地禁用不需要的菜单项，所以这个'新'菜单将只显示你需要的项目。
It allows you to easily disable unwanted menu items, so this' New 'submenu will display only the items that you need.
它可以让你轻松地禁用不需要的菜单项，所以这个'新'菜单将只显示你需要的项目。
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