Use bindable string variable to set the Label text

           

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
  creationComplete="checkEI()">
  <mx:Script>
    [Bindable]
    public var eiStatus:String;
    private function checkEI():void {
      eiStatus = ExternalInterface.available.toString();
    }
    </mx:Script>
  <mx:Label id="l1" text="{eiStatus}" />
</mx:Application>

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Use bindable string variable to set the Label text : Label « Components « Flex

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