available.add(availableScroller, BorderLayout.CENTER);
JPanel buttons = new JPanel();
buttons.setLayout(new BoxLayout(buttons, BoxLayout.Y_AXIS));
JButton addButton = new JButton("<---");
addButton.addMouseListener(new MouseListener() {
public void mouseClicked(MouseEvent e) {
String selected = availableList.getSelectedValue().toString();
Vector<String> extendsConfig = new Vector<String>(state
.getSelected().getModel().getExtendsConfig());