Using of scrollbar in XML menu tutorial

I use this XML menu of Kirupa tutorials.

I use the message area (message_txt.text is name of the text field in the source of the tutorial - link above) to display the text on my site.
Now I solve the problem how make the srollbar component (srollbar component of Flash MX) invisible if ist not needed.

Can you help me?

I tried to use this tutorial, but in the can I not use it.