RadPanel - CSS Class for root item with no child

Hi all.
I worked off the Sitefinity skin for the RAdPanel to create somethign that suites my needs...except for one thing.
I am trying to find a way to put some specific styling for a root item that has no child.
I haven't found any CSS class that allows me to do this.
Would someone have an idea by any chance?
The goal is to put a specific icon to indicate this branch has no child.
Thanks!