Flex 4 ComboBox 绑定有关问题, ！（急）

Flex 4 ComboBox 绑定问题, 求助！！！（急）
以下是代码 ：测试页面ComboBox 下拉列表只显示4列[object object]
[object object]
[object object]
[object object]
[object object]
请各位高手帮忙解决。不要给我Flex 3 的代码！(不要<mx:Script> mx的)谢谢 ！！  

JScript code

<?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 verticalAlign="middle" horizontalAlign="center"/>    </s:layout>    <fx:Script>        <![CDATA[            import mx.collections.ArrayCollection;            import mx.collections.ArrayList;            import mx.events.FlexEvent;            [Bindable]            private var dataTest:ArrayCollection=new ArrayCollection([                {lable:"请选择"},                {lable:"测试1"},                {lable:"测试2"},                {lable:"测试3"}            ]);        ]]>    </fx:Script>    <fx:Declarations>        <!-- 将非可视元素（例如服务、值对象）放在此处 -->    </fx:Declarations>    <s:ComboBox id="test" dataProvider="{dataTest}"/></s:Application>