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Adds a second click handler to call the logAction() method, depending on CheckBox control

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" initialize="initApp(event)">     <mx:Script>     import mx.controls.Alert;     private function initApp(e:Event):void {         cb1.addEventListener(MouseEvent.CLICK, handleCheckBoxChange);         b1.addEventListener(MouseEvent.CLICK, logAction);     }     private function handleCheckBoxChange(e:Event):void {         if (cb1.selected) {             b1.addEventListener(MouseEvent.CLICK, logAction);             ta1.text += "added log listener" + "\n";         } else {             b1.removeEventListener(MouseEvent.CLICK, logAction);             ta1.text += "removed log listener" + "\n";         }     }     private function performAction(e:Event):void {         Alert.show("You performed the action");     }     private function logAction(e:Event):void {         ta1.text += "Action performed: " + e.type + "\n";     }   </mx:Script>     <mx:Button label="Perform Action" id="b1" click="performAction(event)"/>     <mx:CheckBox id="cb1" label="Log?" selected="true"/>     <mx:TextArea id="ta1" height="200" width="300"/> </mx:Application>