Thank you for writing.
As Emanuel already mentioned the cleanest approach to achieve this behavior is to make a small modification in the theme that you are using. You can find more information about this in this documentation article: http://www.telerik.com/help/winforms/themes-visualstylebuilder.html
This functionality can also be achieved and with CellFormating/RowFormating events depending on what your goal is - row or cell mouse hover.
Should you have any other questions, I will be glad to assist you.
the Telerik team