Thank you for the question.
I am glad to inform you that we have just released our official Q2 2010 version. For additional information about it, please refer to the Release Notes
section. You can download your free Trial from Your Account.
In regards to your question, with the release of Q2 2010 we updated our documentation, so please refer to the following article which covers your case: Customizing Items (visual appearance)
I hope this helps. If you have additional questions, feel free to contact us.
All the best,
the Telerik team
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system and vote to affect the priority of the items