I’ve been using the Glassfish Admin Console application as a model for how my prototype looks. It’s built in Woodstock JSF, and I think it is a nice example. I was a little disappointed to find out that they achieved the scroll bar for the Navigation tree with Frames, but it seems to work well.
So my current solution for Scrolls is Frames.
Frames, in fact, are used to layout the entire Glassfish Admin Console application (too decent effect). So my prototype looks almost exactly like the Glassfish app.