private Preferences prefs = Preferences.userNodeForPackage(NozzleTipsPanel.class);
public NozzleTipsPanel() {
setLayout(new BorderLayout(0, 0));
tableModel = new NozzleTipsTableModel(Configuration.get());
JPanel panel = new JPanel();
add(panel, BorderLayout.NORTH);
panel.setLayout(new BorderLayout(0, 0));