Правильная последовательность загрузки

[Akopalipsis]

package
{
	import flash.display.Bitmap;
	import flash.display.DisplayObject;
	import flash.display.Loader;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.IEventDispatcher;
	import flash.events.IOErrorEvent;
	import flash.events.MouseEvent;
	import flash.net.URLRequest;
 
	public class Main extends Sprite
	{
		private var _paths:Vector.<URLRequest>;
		private var _images:Vector.<Bitmap>;
		private var _loader:Loader;
		private var _id:uint;
		public function Main() 
		{
			if (stage) init();
			else addEventListener(Event.ADDED_TO_STAGE, init);
		}
 
		private function init(e:Event = null):void 
		{
			removeEventListener(Event.ADDED_TO_STAGE, init);
 
			var xml:Array = ['button-in.png', 'button-out.png'];
 
			_id = 0;
 
			_paths = new Vector.<URLRequest>([]);
 
			var length:int = xml.length;
			for (var i:int = 0; i < length; i++) 
			{
				_paths.push(new URLRequest(xml[i]));
			}
 
			_images = new Vector.<Bitmap>([]);
 
			_loader = new Loader();
			this.addListener(_loader.contentLoaderInfo);
			this.addLoaded(_paths[0]);
		}
		private function addLoaded(url:URLRequest):void
		{
			try 
			{
				_loader.load(url);
			}
			catch (error:Error)
			{
				trace(error.message);
			}
		}
		private function addListener(dispatcher:IEventDispatcher):void
		{
			dispatcher.addEventListener(Event.COMPLETE, dispatcher_completeHandler);
			dispatcher.addEventListener(IOErrorEvent.IO_ERROR, dispatcher_ioErrorHandler);
			trace("###Слушатели - добавлены");
		}
		private function removeListener(dispatcher:IEventDispatcher):void
		{
			dispatcher.removeEventListener(Event.COMPLETE, dispatcher_completeHandler);
			dispatcher.removeEventListener(IOErrorEvent.IO_ERROR, dispatcher_ioErrorHandler);
			_loader = null;
			trace("###Слушатели - удалены");
		}
		private function dispatcher_ioErrorHandler(event:IOErrorEvent):void 
		{
			trace(event.errorID);
		}
 
		private function dispatcher_completeHandler(event:Event):void 
		{
			var bitmap:Bitmap = event.target.content as Bitmap;
			_images[_id] = bitmap;
			_id++;
			_paths.shift();
			if (_paths.length) this.addLoaded(_paths[0]);
			else this.removeListener(_loader.contentLoaderInfo);
		}
	}
 
}

[in4core]

У меня чуть попроще было

package com.in4core.loaders 
{
	import flash.display.Loader;
	import flash.events.Event;
	import flash.events.EventDispatcher;
	import flash.events.IOErrorEvent;
	import flash.net.URLRequest;
 
	/**
	 * ...
	 * @author in4core
	 * // Class for Loading multi images for Air
	 */
	public class CustomMultiLoader  extends EventDispatcher
	{
		private var _imageArray:Array = [];
		private var _loader:Loader = new Loader();
		private var _images:Array = [];
		private var _index:int = 0;
 
		public function CustomMultiLoader():void
		{
			super();
		}
 
		public function add(imagePath:String):void {
 
			var req:URLRequest = new URLRequest(imagePath);
			_imageArray.push(req);
 
		}
 
		public function load():void {
 
			if (_imageArray == null) return;
 
			if (_index == _imageArray.length ) {
 
				dispatchEvent(new CustomMultiLoaderEvents(CustomMultiLoaderEvents.LOADED , content));
 
				_imageArray = [];
				_index = 0;
				_images = [];
 
				return;
			}
			_loader.contentLoaderInfo.removeEventListener(Event.COMPLETE , loadComp);
			_loader.contentLoaderInfo.removeEventListener(IOErrorEvent.IO_ERROR , onError);
			_loader.contentLoaderInfo.addEventListener(Event.COMPLETE , loadComp);
			_loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR , onError);
			_loader.load(_imageArray[_index]);
			_index++;
 
 
 
		}
 
		private function onError(e:IOErrorEvent):void 
		{
			_imageArray = [];
			_index = 0;
			_images = [];
			dispatchEvent(new CustomMultiLoaderEvents(CustomMultiLoaderEvents.ERROR,[]));
		}
 
		private function loadComp(e:Event):void 
		{
			_images.push(e.currentTarget.content);
			load();
		}
 
		private function get content():Array {
 
			return _images;
		}
	}
 
}

[Akopalipsis]

У меня чуть попроще было

Зато у меня нету проверки на ноль длины массива и на ноль битмапы.

[GrafMine]

С двух предоставленных примеров слепил под себя код, и все получилось.
Спасибо udaaff Akopalipsis in4core