docs: public Component getTreeCellRendererComponent(JTree tree, Object value,
                        boolean selected, boolean expanded,
                        boolean leaf, int row,
                            boolean hasFocus) {
          String stringValue = tree.convertValueToText(value, selected, expanded, leaf, row, hasFocus);
  
          /** Set the text. */
          this.setText(stringValue);
          /** Tooltips used by the tree. */
  //      this.setToolTipText(stringValue);
  
          /** Set the image. */
      /**   if(expanded)
              setIcon(expandedIcon);
          else if(!leaf)
              setIcon(collapsedIcon);
          else
              setIcon(null);
      */
          /** Set the color and the font based on the SampleData userObject. */
          NodeData userObject = (NodeData)((DefaultMutableTreeNode)value).getUserObject();
          /** Update the selected flag for the next paint. */
          this.selected = selected;
  
          if (selected)
              this.setOpaque(true);
          else
              this.setOpaque(false);
  
          return this;
      }