/** Reaction to buttons and combo boxes. */
 public void actionPerformed(ActionEvent e) {
   String cmd = e.getActionCommand();
   if (cmdCtrlProp.equals(cmd)) {
     try {
       Class c =
           Class.forName("aurora.hwc.control.Panel" + myController.getClass().getSimpleName());
       AbstractPanelController cp = (AbstractPanelController) c.newInstance();
       cp.initialize(myController, null);
     } catch (Exception ex) {
     }
   }
   if (cmdCtrlList.equals(cmd)) {
     JComboBox cb = (JComboBox) e.getSource();
     if (cb.getSelectedIndex() > 0) {
       myController = (AbstractControllerComplex) listCControllers.getSelectedItem();
       buttonProp.setEnabled(true);
     } else {
       buttonProp.setEnabled(false);
       myController = null;
     }
     myMonitor.setMyController(myController);
   }
   return;
 }
  /** Generates Configuration tab. */
  private void fillConfigurationPanel() {
    JPanel desc = new JPanel(new GridLayout(2, 0));
    desc.setBorder(BorderFactory.createTitledBorder("Description"));
    desc.add(
        new JLabel("<html><font color=\"blue\">" + myMonitor.getDescription() + "</font></html>"));
    desc.add(cbEnabled);
    cbEnabled.setSelected(enabled);
    cbEnabled.addChangeListener(this);
    confPanel.add(desc);
    JPanel mlpanel = new JPanel(new GridLayout(1, 0));
    mlpanel.setBorder(BorderFactory.createTitledBorder("Monitored Network Elements"));
    montable = new JTable(montablemodel);
    montable.setPreferredScrollableViewportSize(new Dimension(200, 100));
    montable.getColumnModel().getColumn(0).setPreferredWidth(140);
    montable.getColumnModel().getColumn(1).setPreferredWidth(60);
    montable.addMouseListener(
        new MouseAdapter() {
          public void mouseClicked(MouseEvent e) {
            if (e.getClickCount() == 2) {
              int row = montable.rowAtPoint(new Point(e.getX(), e.getY()));
              AbstractNetworkElement ne = null;
              if ((row >= 0) && (row < myMonitor.getPredecessors().size()))
                ne = myMonitor.getPredecessors().get(row);
              else return;
              treePane.actionSelected(ne, true);
            }
            return;
          }
        });
    mlpanel.add(new JScrollPane(montable));
    confPanel.add(mlpanel);
    JPanel cpanel = new JPanel(new GridLayout(1, 0));
    cpanel.setBorder(BorderFactory.createTitledBorder("Controlleded Network Elements"));
    ctrltable = new JTable(ctrltablemodel);
    ctrltable.setPreferredScrollableViewportSize(new Dimension(200, 100));
    ctrltable.getColumnModel().getColumn(0).setPreferredWidth(140);
    ctrltable.getColumnModel().getColumn(1).setPreferredWidth(60);
    ctrltable.addMouseListener(
        new MouseAdapter() {
          public void mouseClicked(MouseEvent e) {
            if (e.getClickCount() == 2) {
              int row = ctrltable.rowAtPoint(new Point(e.getX(), e.getY()));
              AbstractNetworkElement ne = null;
              if ((row >= 0) && (row < myMonitor.getSuccessors().size()))
                ne = myMonitor.getSuccessors().get(row);
              else return;
              treePane.actionSelected(ne, true);
            }
            return;
          }
        });
    cpanel.add(new JScrollPane(ctrltable));
    confPanel.add(cpanel);
    JPanel pcl = new JPanel(new FlowLayout());
    // controller list
    buttonProp.setEnabled(false);
    buttonProp.setActionCommand(cmdCtrlProp);
    buttonProp.addActionListener(this);
    pcl.setBorder(BorderFactory.createTitledBorder("Complex Controller"));
    buttonProp.setEnabled(false);
    listCControllers = new JComboBox();
    listCControllers.addItem("None");
    String[] ctrlClasses = myMonitor.getComplexControllerClasses();
    for (int i = 0; i < ctrlClasses.length; i++) {
      if ((myController != null)
          && (myController.getClass().getName().compareTo(ctrlClasses[i]) == 0)) {
        listCControllers.addItem(myController);
        listCControllers.setSelectedIndex(i + 1);
        buttonProp.setEnabled(true);
      } else {
        try {
          Class cl = Class.forName(ctrlClasses[i]);
          AbstractControllerComplex cc = (AbstractControllerComplex) cl.newInstance();
          cc.setMyMonitor(myMonitor);
          cc.initialize();
          listCControllers.addItem(cc);
        } catch (Exception e) {
        }
      }
    }
    listCControllers.setActionCommand(cmdCtrlList);
    listCControllers.addActionListener(this);
    pcl.add(listCControllers);
    pcl.add(buttonProp);
    confPanel.add(pcl);

    return;
  }