[Resolvido] Máscara dinâmica - falha no empilhamento

Adaptando um arquivo para carregamento totalmente externo.

Tudo funcionando, menos a máscara. Já fiz diversas tentativas, pesquisei outros exemplos, mas ainda não descobri como resolver.

scroll_original: background + logo no stage, setas/btn + fundo/mc p/ TextField pela library. Imagens + texto por XML.

/applications/core/interface/imageproxy/imageproxy.php?img=http://img248.imageshack.us/img248/9610/scrolloriginal.jpg&key=c36e4189c487f9e79953cd5aa05f2ede407c4d12b8a9e859197f8a678c36621c" alt="scrolloriginal.jpg" />

scroll_dynamic:

/applications/core/interface/imageproxy/imageproxy.php?img=http://img687.imageshack.us/img687/9048/scrolldynamic.jpg&key=bc199338a0251a67ab32fe5dd86a61c6d65d69c3accf2a33991adf605817356d" alt="scrolldynamic.jpg" />

obs: seta inicial à esquerda

Trechos do code:

var back:MovieClip = new MovieClip ;
addChild(back);
var url:URLRequest = new URLRequest("imagens/fundo.jpg");
var loader:Loader = new Loader();
loader.load(url);

var logo:Loader = new Loader();
logo.load(new URLRequest("imagens/logotipo2.png"));

var setaDir: MovieClip = new MovieClip;
addChild(setaDir);
var urlDir:URLRequest = new URLRequest("imagens/seta.png");
var botaoAvancar:Loader = new Loader();
botaoAvancar.load(urlDir);

var setaEsq: MovieClip = new MovieClip;
addChild(setaEsq);
var urlEsq:URLRequest = new URLRequest("imagens/seta.png");
var botaoVoltar:Loader = new Loader();
botaoVoltar.load(urlEsq);

loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);
//botaoAvancar.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);
//botaoVoltar.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);
//logo.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);

function onComplete(evt:Event):void

{

back.addChild(loader);

addChild(logo);
logo.x = 310;
logo.y = 5;
}

//... xml

var shapeMask:Shape = new Shape();
var Container:MovieClip = new MovieClip();

var totalArray:int

// ... TextField

shapeMask.graphics.beginFill(0x00ff00, 1);
shapeMask.graphics.drawRect(0,0,stage.width - 100, 150);
shapeMask.graphics.endFill();
shapeMask.x = 50;
shapeMask.y = 110;

Container.cacheAsBitmap = true;
shapeMask.cacheAsBitmap = true;
Container.mask = shapeMask;

addChild(shapeMask);

function showImages():void

{ for(var i:int=0; i < pics.length; i++) {

	loaderPics = new Loader();
	//...
	Container.addChild(loaderPics);

	// mudei p/addChildAt (senão as setas ficam abaixo das imagens) --------
	addChildAt(Container, 1);
	//...

}

showButtons();

//... }

function showButtons():void
{
setaDir.addChild(botaoAvancar);//--------
setaDir.buttonMode = true;//-------------

botaoAvancar.x = stage.stageWidth -45;
botaoAvancar.y = (stage.stageHeight * .5) + 30;

setaEsq.addChild(botaoVoltar);//---------
setaEsq.buttonMode = true;//-------------

botaoVoltar.x = 45;
botaoVoltar.y = (stage.stageHeight * .5) + 30;
botaoVoltar.scaleX *= -1;

//...

}

Agradeço quem puder dar uma mão.

Abraços