Thank you for the demo link - now I see the problem so there is no need to send a demo. Our initial investigation shows that the reason for it is the overriding some of the background styles in IE6 which looks like a browser's bug, but at this point we cannot tell for sure. I notified our Devs and they will continue the research and hopefully provide a fix soon.
Your points were updated.
All the best,
the Telerik team
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