pan = builder.getPanel();
pan.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
add(pan, BorderLayout.CENTER);
namesNatbib.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent changeEvent) {
abbrNames.setEnabled(!namesNatbib.isSelected());
lastNamesOnly.setEnabled(!namesNatbib.isSelected());
noAbbrNames.setEnabled(!namesNatbib.isSelected());
}