Thank you for writing.
Since Q2 2014 this feature is available in RadScheduler
from the Telerik UI for WinForms suite. Here
is the feedback item for your reference. I would recommend you to upgrade to at least version 2014.2.617
where this functionality was introduced.
I hope this information helps. Should you have further questions, I would be glad to help.
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Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items