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  4. Use available property to detect support for the ExternalInterface API before executing methods that use the class


    xmlns:mx="library://ns.adobe.com/flex/mx"
    xmlns:s="library://ns.adobe.com/flex/spark" creationComplete="checkEI()">
    
        
    
    
         
        [Bindable] 
        public var eiStatus:String; 
        private function checkEI():void { 
            eiStatus = ExternalInterface.available.toString(); 
        }