Do you need to allow creating links only when the user starts drawing over an anchor point? I think we did that some time ago using a custom Behavior class.

The base implementation always starts moving or resizing the node if a handle of a selected node is hit. You might move the code that hit-tests for anchor points to a separate method, call it from your diagram_HitTestAdjustmentHandles handler, and if it returns a point, set HitResult to -1. This seems to work fine in the "Anchor point Action" project you sent us some time ago.

internal static AnchorPoint GetAnchorAt(DiagramNode node, Point point)
{
	foreach (AnchorPoint ap in node.AnchorPattern.Points)
	{
		Rect r = node.Bounds;
		Point p = new Point(
			r.Width * ap.X / 100 + r.X,
			r.Height * ap.Y / 100 + r.Y);

		if (MindFusion.Utilities.Distance(p, point) < 10)
			return ap;
	}

	return null;
}

// in the HitTestAdjustmentHandles handler
if (n.AnchorPattern != null && DrawLinkAtAnchorBehavior.GetAnchorAt(n, e.MousePosition) != null)
{
	e.HitResult = -1;
	return;
}
 

I hope that helps,
Stoyan