The RadFilter support adding a new filtering group and you could add expressions to the new added group. More information about groups you could find on the following online documentation article: http://www.telerik.com/help/aspnet-ajax/filter-overview.html
Also you could add a filter expressions and groups programmatically. For more information please check this link. Additionally I am sending you a simple example which demonstrates dynamically adding expressions and groups.
Please check it out and let me know if it helps you.
I was thinking of changing the user interface of the radfilter, please see the image I attached and let me know if this can be done easily. Your reply pertains to adding new expression or group but I believe that does not answer my question.
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Radoslav
Telerik team
answered on 16 Aug 2011, 08:13 AM
Hello Sk,
Unfortunately the RadFilter does not support the desired functionality, concerning changing its user interface. You could change only its look by changing its css styles. However the user interface from the provided image demands different rendering of the control and RadFilter control does not support this.