[ChuwY]

for example

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;
  }
}