When does the horizontalScrollBar get created on a List?

Question

When does the horizontalScrollBar get created on a List?
The scroller is created, but the scrollbar isn't created yet and I get an error:
I have a spark List:
<s:List id="list" creationComplete="creationCompleteHandler(event)">
        <s:layout>
            <s:HorizontalLayout  />
        </s:layout>
</s:List>
private function creationCompleteHandler(event:FlexEvent):void {
     (event.currentTarget as List).scroller.addEventListener( FlexEvent.UPDATE_COMPLETE, onScrollerComplete );
// these don't trigger anything!
//    (event.currentTarget as List).scroller.addEventListener(FlexEvent.CREATION_COMPLETE , onScrollerComplete );
//    (event.currentTarget as List).scroller.addEventListener(Event.ADDED_TO_STAGE , onScrollerComplete );
private function onScrollerComplete(event:Event):void {
     // horizontalScrollBar still null at this point - how can I use it?   
     // I want to set the style, but it's not created yet!
     // event.currentTarget.scroller.horizontalScrollBar.setStyle("repeatInterval", 600);

Answer 1

I just realized that
this.setIconImage(new ImageIcon("image.jpg").getImage())
did not create the icon for my saved files.
So what did create it? I did not program it!
However, I happen to have an icon file Ananya.ico where I have my java project. I use if for my installation file. Did Java use this icon?
Please help! Thanks!