Hello Pedro,

Unfortunately having series with rounded corners is not provided out of the box. There is a way to put round corners on the chart border, but not on the column series. What I can suggest is submitting a new product idea. You can suggest new product ideas for future versions (or vote for existing ones) at http://ideas.infragistics.com.  There are many benefits to submitting a product idea:

-          Direct communication with our product management team regarding your product idea.

-          Notifications whenever new information regarding your idea becomes available.

-          Ability to vote on your favorite product ideas to let us know which ones are the most important to you.  You will have ten votes for this and can change which ideas you are voting for at any time.

-          Allow you to shape the future of our products by requesting new controls and products altogether.

-          You and other developers can discuss existing product ideas with members of our Product Management team.

Steps to create your idea:

1.       Log into the Infragistics Product Idea site at http://ideas.infragistics.com (creating a new account if needed).

2.       Navigate to the product / platform channel of your choice (e.g. WPF, Windows Forms, ASP.NET, Angular, etc.)

3.       Add your product idea and be sure to be specific and provide as much detail as possible.  

Thank you for contacting Infragistics.

Regards,
Ivan Kitanov