Adding an event listener if one isn't present

           
<?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>

1.	Change event for List control
2.	Event listener in an ActionScript function in an tag
3.	List change event
4.	Get selected item from a list from change event
5.	Convert event target to List control
6.	Write your event listener to access the event object
7.	A data-binding watcher invokes an event listener when a binding occurs.
8.	List dragOver, dragDrop, dragExit events
9.	List double click event
10.	Add an Event Listener in MXML

Adding an event listener if one isn't present : List Event « Components « Flex

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