public class LibLoader{

  private var _libLoader  : Loader = new Loader();

  private var _library    : ApplicationDomain;

  public function LibLoader() {

    _libLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, loadCompleteHandler);

    _libLoader.load(new URLRequest("ваш путь"));

  }

 

  public function createInstanceOf(className : String):*{

    var instanceClass : Class;

    try{

      instanceClass = _library.getDefinition(className);  

    } catch (error : ReferenceError){

      return null;

    }

    return new instanceClass();

  }

 

  // handlers

  private function loadCompleteHandler(event : Event):void{

    _library = _libLoader.contentLoaderInfo.applicationDomain;

  }

}