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  4. ButtonBar defines an event listener for the change event


    xmlns:s="library://ns.adobe.com/flex/spark"
    xmlns:mx="library://ns.adobe.com/flex/mx">
    
        
    
    
         
        import spark.events.IndexChangeEvent; 
        private function changeHandler(event:IndexChangeEvent):void { 
                myTA.text="Selected button index: " + String(event.newIndex) + "\n" + 
                    "Selected button label: " + event.target.selectedItem; 
        } 
      
    
    
        
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