In order to have two columns with the same x value not overlapping each other you should use the clustering feature of the TKChart. The idea of the clustering is that you have a common axises and multiple column series drawn. You can read about clustering of columns in our online documentation where we have an example showing how to implement it, here is link
to the article.
I hope this helps.
If you have any further questions do not hesitate to ask.
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items