I prepared a simple project for you that prints the current pages in the RadBook when a print button is clicked. You can find a good starting-point-video
for the Printing API in Silverlight here.
Feel free to ask if you need further assistance.
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!