RadChart has been replaced by RadHtmlChart, Telerik's client-side charting component. If you are considering RadChart for new development, examine the RadHtmlChart documentation and online demos first to see if it will fit your development needs. If you are already using RadChart in your projects, you can migrate to RadHtmlChart by following these articles: Migrating Series, Migrating Axes, Migrating Date Axes, Migrating Databinding, Features parity. Support for RadChart is discontinued as of Q3 2014, but the control will remain in the assembly so it can still be used. We encourage you to use RadHtmlChart for new development.
The RadChart bar series now features "strict mode". This is not a property or setting, but a behavior of bar chart series where X values are respected and bars are positioned according to their XValues. If there are no series items with XValues then RadChart resumes standard sequential ordering of each item. The screen shot above was produced using the following X and Y values: