public LinePanel(WorldWindow wwd, LineBuilder lineBuilder) {
   super(new BorderLayout());
   this.wwd = wwd;
   this.lineBuilder = lineBuilder;
   this.makePanel(new Dimension(200, 400));
   lineBuilder.addPropertyChangeListener(
       new PropertyChangeListener() {
         public void propertyChange(PropertyChangeEvent propertyChangeEvent) {
           fillPointsPanel();
         }
       });
 }