for example

Код AS3:
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;
}
}