MindMapNode node = new MindMapNode();
MindMapConnection conn = new MindMapConnection();
conn.connect(node, node);

public class RelationPart extends AbstractContentPart<RelationVisual> {

  protected void doRefreshVisual(RelationVisual visual) {
    ...
    // update control points
    if (sourcePart == targetPart) {
      // reflexive relation
      relationVisual.setControlPoints(determineReflexiveControlPoints(sourcePart));
    } else {
      // normal control points
    }
  }

  protected List<Point> determineReflexiveControlPoints(NodePart target) {
    Bounds bounds = target.getVisual().getBoundsInParent();
    // TODO: return list of control points, e.g. Arrays.asLists(bounds.x + 5, bounds.y, ...);
  }
...
}