To do that, you first need to have an event handling method in the ManageCustomer controller for an "add" menuitem onClick event.

要完成这些，首先要在ManageCustomer控制器中有“add”菜单项的onClick事件的事件处理方法。

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A MenuItem represents an operation found in the current menu.

MenuItem表示当前菜单中的一个操作。

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The Menu object also contains an attribute called items whose value can be one or more MenuItem objects.

Menu对象还包含一个名为items的属性，该属性的值可以是一个或多个MenuItem对象。

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