Accesses Button id that triggered the event

        

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<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx"
    xmlns:s="library://ns.adobe.com/flex/spark">
    <fx:Script>
         
        import mx.controls.Alert; 
        private function myEventHandler(e:Event):void { 
            Alert.show("The button '" + e.currentTarget.id + "' was clicked."); 
        } 
      
    </fx:Script>
    <s:Button id="b1" label="Click Me" click="myEventHandler(event)" />
</s:Application>

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Accesses Button id that triggered the event : Button Event « Components « Flex

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