Currently there is no way to limit the amount of filters. Cancelling the collection changing is definitely not the way to go. It is not there for that purpose. Please, do not use it in this way.
I have logged your feature request in our PITS system. Please, vote for it
in order to elevate its priority. I hope that I will be able to provide this feature soon.
Thank you for your great suggestion. RadDataFilter is still a young control and we want to shape it according to our customers' suggestions.
All the best,
the Telerik team
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