Note that most of the forum threads are reviewed by Telerik representatives and sometimes we address the questions asked by our customers in the forums as well. However, a post in the forum doesn't guarantee you a response from the Telerik support team. Moreover, threads are handled according to license and time of posting. I would kindly ask you to use our support ticketing system for any further questions as it is the proper way to reach our support staff. Thank you for your understanding.
As a gesture of good will we will address this thread for you. According to the provided screenshot it seems that you use RadScheduler grouped by resources. Note that when adding a Resource, you can specify its Color property. Thus, you can control the color of the cells associated with this resource.