Thank you for writing back.
The time zone drop-down control in RadSchedulerNavigator has to be synchronized with the RadScheduler. If you do not associate the RadScheduler with the RadSchedulerNavigator, you will not be able to see the current time zone in the drop-down. If RadScheduler is not associated with the RadSchedulerNavigator, you can set the value to the drop-down by the following code:
We are working on updating our themes and this will be updated in a future release.
the Telerik team