as3 scrollbar not working with alot of text

[station agent]

Hi,
I am loading text via xml with a scrollbar.
It works and scrolls smoothly.
But if I add to much text, the scrollbar doesn't work well.
It's really hard to drag and "sticks".
Any ideas?
Thanks!

[station agent]

The scrollbar works perfectly as a swf. But if I open the index.html page locally, the scrollbar dragger "sticks". It moves a little, but you can't really control it.