Add the ButtonChrome.xaml end edit the colors in it. The RenderSelected and RenderHighlighted properties of the ButtonChrome will make the control render the colors you point. You can than edit the brushes in the ButtonChrome.xaml which are properly named and apply the ButtonChrome style in the ButtonChrome inside the RadCalendar.
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!