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Define Label and value separately for ComboBox data binding

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">     <mx:VBox>         <mx:Script>                                   private var htmlStr1:String = '<b>Header</b>';                 private var textStr1:String = "this is a test";                      private function setNewText():void                 {                     determineTextType(changeText.selectedItem.value.toString());                 }                      private function determineTextType(str:String):void                 {                     var regexp:RegExp = /<.+\w.>/;                     textArea.text = String(regexp.test(str));                 }                         </mx:Script>         <mx:ComboBox id="changeText" dataProvider="{                     [{label:'HTML1', value:htmlStr1},                      {label:'Text1', value:textStr1}]}" change="setNewText()"/>         <mx:TextArea id="textArea" height="100%"/>     </mx:VBox> </mx:Application>