Eh I can give you the view, a complete example goes beyond a few hundred lines of code : /
As I said, all you need to view the issue is to try to add a custom editor template to the connector and try to emulate the "from" and "to" drop down lists, like the ones from this example: http://demos.telerik.com/aspnet-mvc/diagram/editing
As you can see, they get filled with the present shapes in the automatic editor, whereas I can't seem to be able to emulate the same behavior from a custom editor template.
Also, say that in that custom editor I want to make changes to a nested object, how would I go about that? Say that I have a "Node" model that has a "Data" instance with miscellaneous fields inside it, how could I make an editor template that lets me edit the Data fields?