When clicking a Button control, the Button control dispatches a click event
<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"> <mx:TextInput id="myInput" width="150" text=""/> <mx:Button id="myButton" label="Copy Text" click="myText.text=myInput.text;"/> <mx:TextArea id="myText" text="" width="150" height="20"/> </mx:Application>