flex 做的省市二级联动

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<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" backgroundGradientColors="[#ffffff,#ffffff]">
    <mx:Script>
        <![CDATA[
            public function changeHandler(e:Event):void
            {
                city.dataProvider=e.target.selectedItem.item;
                city.selectedIndex=0;               
            }
        ]]>
    </mx:Script>
    <mx:XML id="xmlPC_linked" source="PC_linked.xml"/>
    <mx:Panel x="262" y="144" width="296" height="200">
        <mx:ComboBox  id="pro" dataProvider="{xmlPC_linked.node}" labelField="@label" change="changeHandler(event)"/>
        <mx:ComboBox  id="city" labelField="@label"/>       
    </mx:Panel>
</mx:Application>

数据xml:PC_linked.xml

<?xml version="1.0" encoding="utf-8"?>
<root>
    <node label="北京市" type="0">
        <item label="东城区"/>
        <item label="西城区"/>
        <item label="朝阳区"/>
        <item label="海淀区"/>
    </node>
    <node label="上海市" type="0">
        <item label="黄浦区"/>
        <item label="卢湾区"/> 
    </node>
    <node label="湖南省" type="0">
        <item label="长沙"/>
        <item label="衡阳"/>      
    </node>
    <node label="广东省" type="0">
        <item label="广州市"/>
        <item label="深圳市"/>
    </node>
</root>