ASPRUNNER 6.1 how create submenu

Hi AspRunners,

I am very happy for the AspRunner 6.1 release.

I want to make for my project a collapsable main menu with submenu, just like this demo http://livedemo.asprunner.net/asprunner/livedemo1/menu.asp

I can't find a tutorial or a sample or a help guide to understand how to create this...
Can anybody post a link or whatever else can help me...

Thank you very much!