ASP.Net Menu Control – Horizontal – Not Showing Sub Options

I am trying to use the ASP:Menu control. It is rather simple. I want it Horizontal. Each of those first level items will have Sub items. I can get it Horizontal and when I hover over the Instant Reports or the Configurable Reports choice it seems to pop down a div or something but it is empty. I have tried formatting and everything I can think of as well as find on the internet. What am I doing wrong?