[RESOLVED] Dynamic Scrollpane not scrolling

Hi, am am building a dynamic timeline loaded using xml. The content is build in class dateline and displays correctly in scroll pane, except that it does not scroll.

Code:

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package MyClasses{
        import flash.display.MovieClip;
        import flash.net.URLRequest;
        import flash.display.Sprite;
        import fl.containers.ScrollPane;
        import fl.controls.ScrollPolicy;
        public class Main extends MovieClip {
                private var sp:ScrollPane = new ScrollPane();
                private var spSource:Sprite  = new Sprite();
                private var req:URLRequest;
                private var xml:XMLReader;
                private var dateLine:DateLine;
                public function Main() {
                       
                        sp.horizontalScrollPolicy = ScrollPolicy.AUTO
                        sp.verticalScrollPolicy = ScrollPolicy.AUTO
                        sp.setSize(550,400);
                        req = new URLRequest("MyClasses/assets/xml/data.xml");
                        xml=new XMLReader();
                        xml.load(req);
                        dateLine = new DateLine(xml);
                        spSource.addChild(dateLine);
                        sp.source = spSource;
                        sp.update();
                        addChild(sp);
                }
        }
}

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Just tried another solution that seems to solve the problem. Instead of adding the scroll pane to main class, I added it to the dateline class and then addChild(dateline) to stage.

If any other option it would be on interest, thanks