I've been trying to do this for a couple hours now, without much success.  I've read that the orginal menu would allow scrolling if items were excessive, but I found no examples, only mentions within articles.  I have also been able to get a horribly working version using CSS on ui.AspNet-Menu-WithChildren ul with overflow set to scroll, but I really don't want the horizontal scrollbar.

Overall, I've got questions.

1.) Have I overlooked something obvious?
2.) Can anyone show me a decently working example, even if its just a live demo?