Thank you for your question.
Since the introduction of the BookStore Kiosk, we have made a number of changes to our RadControls for Winforms product, which is the foundataion of the application. The application has still not been updated to work with the latest version of our product, and this is the most probable reason for the the behavior you're observing.
We are in the process of updating the BookStore Kiosk to work with the latest release - Q1 2008 SP1. We will release this update on the website by the end of this week.
If you have additional questions, do not hesitate to contact me.
the Telerik team