Thank you for contacting us.
We do not have an example how to particularly match the style of the BusyIndicator to the GridView. However, you can refer to these help articles in which is explained how to style the BusyIndicator: http://www.telerik.com/help/silverlight/radbusyindicator-styles-and-templates-overview.html
Hope this information helps. Please let us know if you have further questions.
All the best,
the Telerik team
Let us know about your Windows Phone 7 application built with RadControls and we will help you promote it. Learn more>>