Hello Divyesh Chapaneri,
I am glad to hear that you found the answer to your question. Indeed, we made separate theme components for the different predefined themes: Aqua, Desert, Miscellaneous, Office2007Silver, Office2007Black, Telerik and Vista.
Regarding the Vista theme for RadGridView (white background with blue row hover and selection), it is the default theme for this control. So, when you choose ControlDefault, you actually choose the Vista theme.
If you have additional questions, feel free to contact me.
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.