Thank you for contacting us.
Could you please specify where do you get this error?
We introduced our new RadDateTimePicker control this Q2 release and we made some required changes with date and time pickers. We tried to make as few changes to the controls as possible. Now RadDatePicker and RadTimePicker controls inherit RadDateTimePicker.
AreWeekNumbersVisible property is now Obsolete. If you want to disable the week numbers, for example, you could accomplish this by setting a Style for CalendarStyle property and in this style you could set the value for the property AreWeekNumbersVisible to False.
I hope this helps. I will be glad to assist you further.
the Telerik team
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