Thank you for contacting us.
The concept of RadRating is that you can have a rating between 1 and the number of items of the control. There is no zero rating as it would look the same as the rating when no vote is applied. If you mean that you want to reset the control as if no rating is applied, then you can do this programmatically by setting its Value to zero. If you imagine the zero rating looking differently, we'd be happy to hear your suggestion.
I hope this information helps. If you have other questions, don't hesitate to write us back.
the Telerik team
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