Thank you for contacting us and for your question.
Currently the functionality you describe is not possible and there is no easy workaround.
We however are making a complete revamp of the control's architecture and this revamp will implement the behavior you describe. The control is currently based on RadLoopingList and this dependency does not fit well in all the scenarios that we want to support. Listening to our users' feedback we decided to make it more generic so that it can be easily extended to support different predefined use cases as well as entirely custom ones. This new version of the control will be available for the official Q1 2012 release - expected by the middle of February.
I hope this information is useful. Do not hesitate to write us back should you have any other question/problem with our tools.
the Telerik team
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