We plan to provide a fix in our next release in January. In case this is a show stopper, we can send you a custom build next week.
Untiul then, you can temporarily install Q2 SP1 and use the VSB which comes in it. Since there are not changes in the theming mechanism between Q2 and Q3, you can style your grid with the older version, export the theme to XML and apply it to your Q3 project.
Again, we are sorry for this. Do not hesitate to write me back if you have more questions.
All the best,
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.