Прислушайтесь к совету
Wolsh.
Набросал код.

Код AS3:
package
{
import flash.display.Loader;
import flash.display.MovieClip;
import flash.display.Sprite;
import flash.events.Event;
import flash.net.URLRequest;
import flash.system.ApplicationDomain;
import flash.system.LoaderContext;
import flash.utils.getDefinitionByName;
public class TestLoading extends Sprite
{
protected var loader:Loader = new Loader();
protected var skinsAppDomain:ApplicationDomain = new ApplicationDomain();
public function TestLoading()
{
this.init();
}
private function init():void
{
this.load();
}
private function load():void
{
var context:LoaderContext = new LoaderContext(false, this.skinsAppDomain);
//
this.loader.contentLoaderInfo.addEventListener(Event.INIT, this.onLoaded);
this.loader.load( new URLRequest('skins.swf'), context );
}
protected function onLoaded(event:Event):void
{
// Symbol2 это Linkage-Class клипа во флешке skins.swf
var SymbolFromLibrary:Class = this.skinsAppDomain.getDefinition('Symbol2') as Class;
var clipFromLibrary:MovieClip = new SymbolFromLibrary();
super.addChild(clipFromLibrary);
}
}
}