Targeting parent movie clips from a externally loaded swf AS3

Okay I'm trying to target the containing movie clip of an externally loaded swf with AS3.

im still kind of new to AS3. so bear with me....

first parent being the root of the loaded swf. and the next parent being the movieclip that contains the loader.

working AS2: = "false";

tested AS3: = 'false";
error: 1119: Access of possibly undefined property bg through a reference with static type flash.display:DisplayObjectContainer.

attached is the method i used for loading the swf.
bg.visible = false;

import flash.display.*;
import flash.text.*;

var f:String = "vortex.swf";
var tf:TextField = new TextField();

var loader:Loader = new Loader();
var container= new MovieClip();

function preloader() {
loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onLoadProgress);
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, completeHandler);

var request:URLRequest = new URLRequest(f);



function onLoadProgress (event:ProgressEvent):void {

var loaded:Number = event.bytesLoaded;
var toLoad:Number = event.bytesTotal;
var total:Number = loaded/toLoad;{
//preloader_mc.preloaderFill_mc.scaleX = total;
loadText.text = Math.floor(total*100) + "%";
//preloader_mc.ofBytes_txt.text = loaded + " bytes";
//preloader_mc.totalBytes_txt.text = toLoad + " bytes";

function completeHandler(event:Event):void {

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not sure where you want to do this but assuming your bg is on the main timeline and after your swf is loaded you want to show your bg

function completeHandler(event:Event):void {
      container.addChild(loader); = true;
CybervanesAuthor Commented:
i need to be able to target the background MC of the main swf from the child swf.
when what happens? i.e what event?
CybervanesAuthor Commented:
when the time-line hits frame 15
ok what you want to do is obviously possible but if you're going to be developing in AS3 you want to start using classes and multiple frames etc.

in frame 15 of your loaded swf

MovieClip(parent.parent.parent).bg.visible = true; //where bg is the instance name.

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