Dynamic scrollbars

Hi!
I have created a dynamic scrollbar with the code :

_root.createEmptyMovieClip("textHolderMC",1);
textHolderMC.loadVariables("boende.txt");
textHolderMC.onData = function() {
tf.text = this.boende;
sb.setScrollContent("tf");
};

But now i need an other one on the same page, so i did thise :

_root.createEmptyMovieClip("textHolderMC",1);
textHolderMC.loadVariables("boende.txt");
textHolderMC.onData = function() {
tf.text = this.boende;
sb.setScrollContent("tf");
};
_root.createEmptyMovieClip("accessMC",2);
accessMC.loadVariables("access.txt");
accessMC.onData = function() {
tf2.text = this.access;
sb2.setScrollContent("tf2");
};
But the second one won´t scroll.

any ideas? You can dowload my fla here (test.zip, about 1kb).

Thank you!