We are in a process of adding article in our documentation regarding custom connectors and MVVM RadDiagram. It will be live before R1 2018 in January.
Till then, you can take a look at the following forum threads where some projects are also listed:
Custom Connectors and MVVM
Adding Custom Connectors in XAML style
You can also vote for the following feature request:
Diagram: Built-in support for MVVM connectors
In addition to the projects, you can add string properties named, for example SourceConnectorPos, TargetConnectorPos in the Link model class. They can have default values of "Auto" and be bound to the SourceConnectorPosition
properties of the RadDiagramConnection
via Style which applies to the connections. This way you have the ability to specify to which custom connector every connection attaches in the moment of creating the graph source.
Please let us know if you need any further assistance.
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