How can I detect when the user moves one of the anchor points of my route?

I figured this should be simple, but I haven’t been able to find out how to detect when a user moves one of the anchor points on one of the links in a diagram. I suppose there must be an event that gets triggered, so I would need to listen to that event, but which one?

The Diagram.LinkReshaped event: GoXam for WPF v3