Keep in mind that the ProgressBar - First Look demos uses the Windows8 theme of our controls. In order to have this animation in your ProgressBar you can change its theme to Windows8. The old mechanism that was used for setting a theme was the StyleManger. However, now we have a new Implicit Styles mechanism which we highly encourage our clients to use instead of the StyleManager because it has well known advantages that you can see in Implicit Styles versus StyleManager
Check out Telerik Analytics, the service which allows developers to discover app usage patterns, analyze user data, log exceptions, solve problems and profile application performance at run time. Watch the videos
and start improving your app based on facts, not hunches.