Thank you for writing.
is a new control and it has been available since our Q3 2015 (version 2015.3.930)
release. Please check the release notes for details: http://www.telerik.com/support/whats-new/winforms/release-history/ui-for-winforms-q3-2015-(version-2015.3.930)
I hope this helps. Should you have further questions please do not hesitate to write back.
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