Currently there is no such possibility out-of-the-box, but I hope that I will be able to implement that functionality in early January. I plan to add an AutoLoad property to the control. When set to false, the query will not be executed unless you manually call the Load() method. When AutoLoad is true the query will be executed against the server each time it changes, i.e. someone adds a new filter.
I hope this will help.
the Telerik team
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