(I moved this post from the GoDiagram forum.)
You need to override the MakeXElement and LoadFromXElement methods. The documentation for GraphLinksModelNodeData and for those two methods gives examples. And there are lots of examples in the sample apps too.
This strategy gives you control over what to save/load, and how to do so.
sorry, posted in the wrong forum accidently
That’s OK – we changed the order that we list the forums, so we expected some confusion.