Macromedia flex 2 Manual

Defining events in ActionScript components

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Custom components that extend existing Flex classes inherit all the events of the superclass. If 
you extend the 

Button

 class to create the MyButton class, you can use the events inherited 

from the Button class, such as 

mouseOver

 or 

creationComplete

, as the following example 

shows:

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 

xmlns:MyComp="myComponents.*"> 

<mx:Script>

<![CDATA[

import flash.events.Event;

private function handleClick(eventObj:Event):void {

// Define event listener.

}

private function handleCreationComplete(eventObj:Event):void {

// Define event listener.

}

]]>

</mx:Script>

<MyComp:MyButton 

click="handleClick(event);" 
creationComplete="handleCreationComplete(event);"/>

</mx:Application>

Your custom components can also define new events based on the requirements of your 
components. For example, the section 

 showed how to define a custom event so that properties of your component can 

work with the Flex data binding mechanism. 

This section describes how to handle events within a custom component and how to create 
events for it.

Handling predefined events within the component

The previous section showed a custom component, MyButton, dispatching two events. In 
that section, you defined the event listeners in the main application file.