protected void createButtons(JPanel panel) {
   panel.add(new Filler(24, 20));
   JComboBox drawingChoice = new JComboBox();
   drawingChoice.addItem(fgUntitled);
   String param = getParameter("DRAWINGS");
   if (param == null) {
     param = "";
   }
   StringTokenizer st = new StringTokenizer(param);
   while (st.hasMoreTokens()) {
     drawingChoice.addItem(st.nextToken());
   }
   if (drawingChoice.getItemCount() > 1) {
     panel.add(drawingChoice);
   } else {
     panel.add(new JLabel(fgUntitled));
   }
   drawingChoice.addItemListener(
       new ItemListener() {
         public void itemStateChanged(ItemEvent e) {
           if (e.getStateChange() == ItemEvent.SELECTED) {
             loadDrawing((String) e.getItem());
           }
         }
       });
   panel.add(new Filler(6, 20));
   JButton button;
   button = new CommandButton(new DeleteCommand("Delete", this));
   panel.add(button);
   button = new CommandButton(new DuplicateCommand("Duplicate", this));
   panel.add(button);
   button = new CommandButton(new GroupCommand("Group", this));
   panel.add(button);
   button = new CommandButton(new UngroupCommand("Ungroup", this));
   panel.add(button);
   button = new JButton("Help");
   button.addActionListener(
       new ActionListener() {
         public void actionPerformed(ActionEvent event) {
           showHelp();
         }
       });
   panel.add(button);
   fUpdateButton = new JButton("Simple Update");
   fUpdateButton.addActionListener(
       new ActionListener() {
         public void actionPerformed(ActionEvent event) {
           if (fSimpleUpdate) {
             setBufferedDisplayUpdate();
           } else {
             setSimpleDisplayUpdate();
           }
         }
       });
 }
 protected void setBufferedDisplayUpdate() {
   view().setDisplayUpdate(new BufferedUpdateStrategy());
   fUpdateButton.setText("Buffered Update");
   fSimpleUpdate = false;
 }
 protected void setSimpleDisplayUpdate() {
   view().setDisplayUpdate(new SimpleUpdateStrategy());
   fUpdateButton.setText("Simple Update");
   fSimpleUpdate = true;
 }