I highly reccomend that you upgrade to the latest version of our controls so that you gain the Step Line series implementation with full support for Stack Combine Mode.
Please mind that the workaround previously povided is not an ultimate hack that will work for any scenario. It is just a hack for creating a standalone Step Line serie but we do not guarantee how this would behave when Pan/Zoom , TrackBall or Combine Mode features of ChartView are used with it.
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.