[KLieriK]

Хелп говорит:

Event listeners let an object, called a listener object, receive events broadcast by another object, called a broadcaster object. The broadcaster object registers the listener object to receive events generated by the broadcaster. For example, you can register a movie clip object to receive onResize notifications from the Stage, or a button instance could receive onChanged notifications from a text field object. You can register multiple listener objects to receive events from a single broadcaster, and you can register a single listener object to receive events from multiple broadcasters.

var listenerObject:Object = new Object();
listenerObject.eventName = function(eventObj:Object) {
    // Your code here
};
broadcasterObject.addListener(listenerObject);