This behavior is expected. Imagine that you are not in MonthView and want to navigate thought the months, this wouldn't be possible if they are not selectable. Maybe we have to consider the situation when you are using only MonthView and think about making the months not selectable. What you can do is use DisplayDateStart and DisplayDateEnd and the months won't be visible. Another option is to edit the CalendarTemplate and make the desired months disabled.
the Telerik team
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