Yes, I understand your requirement. You can subscribe to the OnNavigationCommand
server-side event and check whether the command value is NavigateToPreviousPeriod.
In that case you can cancel the event. Here's the code for this:
sender, SchedulerNavigationCommandEventArgs e)
(e.Command == SchedulerNavigationCommand.NavigateToPreviousPeriod && RadScheduler1.SelectedView == SchedulerViewType.DayView)
Hope this helps.
the Telerik team