Flex学习笔记--多层菜单按钮

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
 
    <s:layout>
        <s:VerticalLayout/>
    </s:layout>
    <fx:Declarations>
        <s:XMLListCollection id="menuData">
          <s:source>
              <fx:XMLList xmlns="">
                  <menuitem label="Tasks">
                    <submenu label="Add Request"/>
                    <submenu label="Add Person">
                          <submenu label="Customer"/>
                          <submenu label="Employee"/>
                    </submenu>
                  </menuitem>
              </fx:XMLList>
          </s:source>
        </s:XMLListCollection>
    </fx:Declarations>
    <s:Button label="Display Menu" click="menu.show()"/>
    <mx:Menu id="menu" showRoot="true" labelField="@label" dataProvider="{menuData}"/>
    
</s:Application>