If you have a licensed copy of the RadControls for ASP.NET AJAX you can use the RadMenu control, otherwise a trial message will appear. As for the theme - it is matter of styles, so there are no license restrictions.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items