Hi Michael,
Thanks for your interest in Syncfusion products.
You can either use the content of the node to set the Path object or even you can use the CustomPathStyle property to set the custom path.
You can refer to the User Guide link where we have described about adding Custom Path to a node.
http://help.syncfusion.com/ug_82/SilverlightUI_Diagram/defaultSilver.htmlNavigate to Concepts and Feature-> Nodes->How to specify Custom Path Style to a node.
Please let us know if you have any queries.
Regards,
Deepa V