Berthold,
Cool indeed! Hartelijk dank.
I did have to make a small adjustment before I got it to work. In transmenu.ascx removed the trailing slashes: "/admin/skins/transmenu" to "admin/skins/transmenu".
Final remaining problem is getting the submenus starting to dropdown a little lower below the "root-items". Judging from the
http://www.gbsdeplantage.nl you might have had the same problem, right?
Thanks again for sharing.