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Use BindingUtils to bind property

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)">   <mx:Script>              import mx.binding.utils.BindingUtils;         import mx.binding.utils.ChangeWatcher;         private var _changeWatcher:ChangeWatcher;         private function initializeHandler(event:Event):void {             _changeWatcher = BindingUtils.bindProperty(selectedLevel, "text",level, "value");         }      </mx:Script>   <mx:VBox>     <mx:ComboBox id="level">         <mx:Array>             <mx:Object label="A" data="1" />             <mx:Object label="B" data="2" />             <mx:Object label="C" data="3" />             <mx:Object label="D" data="4" />         </mx:Array>     </mx:ComboBox>     <mx:TextInput id="selectedLevel" />   </mx:VBox> </mx:Application>