as3signals で ActionScript3 の Event をやめよう ref: http://qiita.com/tosik/items/2c1596abf3d43077fe6e

Bar.as

var button:Button = new Button();
button.clicked.add(function():void {
    trace("The button clicked.");
});

ButtonEvent.as

public class ButtonEvent extends Event
{
    public static const CLICKED:String = 'CLICKED';
    public function RestartEvent(type:String, bubbles:Boolean=false, cancelable:Boolean=false)
    {
        super(type, bubbles, cancelable);
    }
}

Clicked.as

public class Clicked extends Signal
{
}

Foo.as

public class Button
{
    public const clicked:Signal = new Signal;
    public function click():void
    {
        clicked.dispatch();
    }
}