Are you able to reproduce this behavior in our online demo: http://demos.telerik.com/silverlight/#ScheduleView/SpecialSlots
If not, could you please prepare a sample application and send it to us, which we could be able to run here locally in order to track down the source of the problem. In that way we will be able to provide you with solution in a timely manner.
Looking forward to your reply.
the Telerik team
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