Access a movieClip within a different swf?

Currently I found this code and adapted it to my document.

var myLoader:Loader = new Loader();
var myUrlReq:URLRequest = new URLRequest("web11.swf");
myLoader.load(myUrlReq);
myLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoaded);

    function onLoaded(event:Event):void
    {

    var Buttongroup:Class = event.target.applicationDomain.getDefinition("Buttongroup") as Class
    var mySquare:MovieClip = new Buttongroup() as MovieClip;
    addChild(mySquare);
    }

This works if I wanted to load the class “Buttongroup” but I want to load the movieClip ‘clipHolder’ which is a new instance of buttonclass (with functions applied to it) Any help is really appreciated :love_heart: