External Text vs UIScrollbar

I’m in desperate need of some help!
I am trying to load some external text, from a .txt file, into a dynamic textfield inside of Flash. Because the text will be pretty long, I have decided to use a scrollbar, a UIScrollbar.

So when I decide to test the movie (ctrl+enter) it works like it should.
But when I publish it (f12), the scrollbar won’t work! The arrows and the slider disappears.

Why? I usually sort these kind of problems out for myself. But this problem, seems to me, totally illogical. Is it a glitch of some sort?

I am using Flash CS3 and Action Script 3.

Help, would be much appreciated!

Here is my code.

var loader:URLLoader = new URLLoader(new URLRequest("texten2.txt"));
loader.addEventListener(Event.COMPLETE, TextLoad);

function TextLoad(event:Event):void {
    var loadedText:URLLoader = URLLoader(event.target);
    scrollWindow.scrollTxt.htmlText = loadedText.data;