Listbox problem... From POM's tutorial

Hi there…
I am now on ListBox, trying to learn how to create my own…
I am using the following tutorial found here in kirupa:
http://www.kirupa.com/developer/mx/listbox.htm
It was made by POM.
I am trying to add a horizontal scroll bar to the listbox, but i am UNABLE.
I tried **list.hScrollPolicy = “on”; **Where list is a instance of ListBox.
But it didnt work.

Can anyone please help me?
Thanks…

Leo.