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Check to see if button has certain type of event

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" width="100%"     height="100%" layout="vertical">     <mx:Script>                  import mx.controls.Alert;         [Bindable]         public var labelText:String = "Label before event";                  public function clickFunction(event:Event):void         {             var message:String = "you clicked me! " + event.target.label;             Alert.show(message,"Event Test");         }         public function addMyEvent():void         {             if (myButton.hasEventListener(MouseEvent.MOUSE_OVER)) {                 myButton.removeEventListener(MouseEvent.MOUSE_OVER,changeLabel);                 myInput.text = "Event was Removed";                 addEventButton.label ="Click this button to add event";                 myLabel.text = "Mouse over Event listener removed";             } else {                 myButton.addEventListener(MouseEvent.MOUSE_OVER,changeLabel);                 myInput.text = "Event was added";                 addEventButton.label ="Click this button to remove event";             }         }         public function changeLabel(event:MouseEvent):void         {             myLabel.text = "Mouse over";         }            </mx:Script>     <mx:Button id="addEventButton" label="click this button to add listener" click="addMyEvent()"/>     <mx:Button id="myButton" label="Click button!" click="clickFunction(event)"/>     <mx:Label id="myInput"/>     <mx:Label id="myLabel" text="{labelText}"/> </mx:Application>