These are all the Links that lead out of your selected Node. In code, this highlighting is performed by:
Node node = myDiagram.SelectedPart as Node; if (node != null) { foreach (Link link in node.LinksOutOf) // For that Node, find all LinksOutOf, cast as ((NavModelLinkData)link.Data).Highlight = 1; // NavModelLinkData, and set Highlight to true }
All the Links leading out from the SelectedNode are obtained by the LinksOutOf property. Then we get each Link's data and set its Highlight property to 1, as any Link is 1 "relationship" or "step" from the Node it connects with.