The concept controls, as they are used in Sitefinity 4.0 are entirely engineered and developed by the Sitefinity Team. In other words currently Sitefinity 4.0 is the only CMS using such a feature.
the Telerik team
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Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.