Mark,
you can easily do so by specifying the "headerAtrributes" of the desired columns, just like in this example:
http://dojo.telerik.com/@joneff/aQImE.
Note that due to CSS specificity, if you use a single class name, you will need to have !important rule, or alternatively a more specific selector.
If you use inline styles, you don't have to worry about specificity.
Regards,
Ivan Zhekov
Telerik
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