Hi Luis
Thanks for using Syncfusion products.
We have zOrder property for the nodes and connectors but it is not implemented for the connectors. So we consider this as feature and logged a report on this. Also we have created a support incident under your account to track the status of this issue.
Please log on to our support website to check for further updates.
https://www.syncfusion.com/account/login?ReturnUrl=%2fsupport%2fdirecttrac%2fincidents
Please let us know if you need further assistance.
Regards,
Shyam G