@Override
 public void setTree(AlgebraTree tree) {
   super.setTree(tree);
   this.view = (AlgebraViewD) tree;
 }
 @Override
 protected void highlight(EuclidianViewInterfaceCommon ev, ArrayList<GeoElement> geos) {
   if (ev.getMode() == EuclidianConstants.MODE_MOVE) super.highlight(ev, geos);
   else ev.mouseMovedOverList(geos);
 }