Yes, RadControls come with Sitefinity. They need to be added during the development by the developers though. We've had RadControls section in the past, but this wasn't really useful, because every control needs to be setup to work with the system, in other words, it's not something the end user will usually do. I'll give you an example - RadMenu. What should happen if someone drop the RadMenu on the page? Should it show the sitemap, or custom navigation? Or, the RadScheduler - what events should it show?
The RadControls are built in the Telerik.Web.UI assembly, which can be found in the Sitefinity bin directory.
I hope this helps.
the Telerik team
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