[СлаваRa]

package {
	import flash.display.Sprite;
	import flash.events.Event;
 
	/**
	 * @author SlavaRa
	 */
	public class Main extends Sprite {
 
		public function Main():void {
			super();
			if (super.stage) {
				this.onSuperAddedToStage();
			} else {
				super.addEventListener(Event.ADDED_TO_STAGE, this.onSuperAddedToStage);
			}
		}
 
		private function onSuperAddedToStage(e:Event = null):void {
			super.removeEventListener(Event.ADDED_TO_STAGE, this.onSuperAddedToStage);
			// entry point
			var a:A = new A();
			var b:B = new B(a);
			a.setArray([1, 2, 3, 4]);
		}
 
	}
 
}
 
import flash.events.Event;
import flash.events.EventDispatcher;
 
class A extends EventDispatcher {
	public function A() {
		super();
	}
 
	private var _array:Array;
 
	public function setArray(array:Array):void {
		this._array = array;
		super.dispatchEvent(new Event(Event.COMPLETE));
	}
 
	public function get array():Array {
		return _array;
	}
}
 
class B {
	public function B(a:A) {
		super();
		this._a = a;
		this._a.addEventListener(Event.COMPLETE, onAComplete);
	}
 
	private var _a:A;
 
	private function onAComplete(event:Event):void {
		trace("array:", this._a.array); //array: 1,2,3,4
	}
}

у меня все работает