Event Flex


    xmlns:mx="library://ns.adobe.com/flex/mx"
    xmlns:s="library://ns.adobe.com/flex/spark"
    creationComplete="initApp()">
    
         
        import mx.controls.Alert; 
        private function initApp():void { 
            b1.addEventListener("click", function(e:Event):void { 
                Alert.show("The button was clicked."); 
            }); 
        }