Hello Eli,

I have been investigating into the requirement you are trying to achieve in this case, and I believe there is a misunderstanding of what the EndCap of a series does in this case. In the case of a ScatterLineSeries, the very end of the entire line will be what receives the EndCap, although you may not see it if you have markers enabled, as the marker then essentially becomes the end of the line. With the default series Thickness, it may also be rather difficult to see, and so if you would like to see this, I would recommend testing this with a higher series Thickness and with the MarkerType set to “None.”

With the above said, this still won’t really achieve your requirement, but we do have another control that might better suit your needs in this case in the XamDiagram control, since achieving this in the XamDataChart would very likely require quite a bit of custom code, as a custom series would likely need to be created as the simplest way to do this in the chart. Here is a link to our documentation for the XamDiagram control: https://es.infragistics.com/help/wpf/xamdiagram.

If you would like to see this behavior potentially implemented in a future version of the XamDataChart control, I would recommend suggesting a new product idea for this at our WPF Ideas Page, here. This will place you in direct communication with our product management teams who plan and prioritize upcoming features and development based on community and user feedback.

Please let me know if you have any other questions or concerns on this matter.