Define an event listener for the Button control

        
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        
        import mx.controls.Alert;
        private function alertListener():void {
            myText.text = myInput.text;
            Alert.show("Text Copied!", "Alert Box", Alert.OK);
        }
      
    </mx:Script>
    <mx:TextInput id="myInput" width="150" text="" />
    <mx:Button id="myButton" label="Copy Text" click="alertListener();" />
    <mx:TextInput id="myText" />
</mx:Application>

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Define an event listener for the Button control : Button Event « Components « Flex

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