Why not move the anchor point to the tip of that blue arrow? You can specify that the link should be rendered behind node by setting link.ZIndex to a value smaller than node's one. You might as well try using layers, e.g. add two Layer objects to diagram.Layers, set LayerIndex of all links to 0, and LayerIndex of all nodes to 1.

I hope that helps,
Stoyan

Hi,

Layers are available since version 6 of the control. In versions older than 6, ZIndex corresponds to items index within Diagram.Items collection, and it can take values from 0 up to Items.Count - 1. Also they would not let you set ZIndex before adding an item to the diagram. Current version lets you assign arbitrary values to ZIndex.

Another solution you might try is setting link's BaseShape to that arrow instead of drawing it inside the node. You could set BaseShape to null from LinkStartModifying event handler if you don't want the arrow rendered while users drag links, and set it to the arrow shape from LinkCreated / LinkModified events.

I hope that helps,
Stoyan

Try resetting OriginAnchor value:

var ap = link.OriginAnchor;
link.OriginAnchor = -1;
link.OriginAnchor = ap; 

I hope that helps,
Stoyan