flex中combobox绑定xml数据后取不到data解决方法

flex中combobox绑定xml数据后取不到data
问题如题，代码如下

JScript code

<?xml version="1.0" encoding="utf-8"?><mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="init()">    <mx:Script>        <![CDATA[            import mx.collections.ArrayCollection;            import mx.collections.XMLListCollection;                        [Bindable]            private var xml:XML = <root>                                     <item name="datagrid" data="1"/>                                     <item name="combobox" data="2"/>                                     <item name="List" data="3"/>                                    </root>;            [Bindable]            private var xmlLc:XMLListCollection;                        [Bindable]            private var arrC:ArrayCollection;                        private function init():void            {                xmlLc = new XMLListCollection(xml.children());                                arrC = new ArrayCollection();                arrC.addItem({label:"aa",data:"1"});                arrC.addItem({label:"bb",data:"2"});                arrC.addItem({label:"cc",data:"3"});            }                        private function show():void            {                trace(cb.value);                trace(cb.selectedItem.data);                trace("111");            }        ]]>    </mx:Script>    <mx:ComboBox id="cb" x="196" y="263" editable="false" dataProvider="{xml.item}" labelField="@name" change="show()"></mx:ComboBox>    </mx:WindowedApplication>

显示结果如下，为了显示取不到数据我在数据输出后面加了一个输出，先看输出截图

请问这是什么情况，在init()里试着绑定XMLListCollection也取不到值，只有ArrayCollection能取到值，请大家帮我分析下。

[解决办法]
private function show():void
{
var obj:Object = cb.selectedItem;
Alert(obj.@data)
}

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