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Call your method in Button click event

<?xml version="1.0" encoding="UTF-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:Script>          private function calculateFactorial(n:String):String     {         var y:Number=1;         for (var x:Number = 1;x <= Number(n); x++) {             y = y * x;         }         return String(y);     }        </mx:Script>     <mx:Panel title="Calculate Factorial">         <mx:HBox>             <mx:Label text="Input:"/>             <mx:TextInput id="textArea1" text="1"/>             <mx:Button id="button1" label="Calculate" click="result.text=calculateFactorial(textArea1.text)"/>         </mx:HBox>         <mx:HBox>             <mx:Label text="Factorial:"/>             <mx:Label id="result"/>         </mx:HBox>     </mx:Panel> </mx:Application>