Thank you for your interest in this feature. it will be documented till the end of this week.
However, there is no need to inherit the whole diagram. You can create your custom Router by implementing the IRouter Interface:
MyCustomRouter : IRouter
System.Collections.Generic.IList<Point> GetRoutePoints(IConnection connection,
Please let us know if this is suitable for you.
All the best,
the Telerik team
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