private JComponent createButtonPanel() {
final JCheckBox displayColumnsCheckBox = new JCheckBox("Display columns?");
displayColumnsCheckBox.setOpaque(false);
displayColumnsCheckBox.setForeground(WidgetUtils.BG_COLOR_BRIGHTEST);
displayColumnsCheckBox.setSelected(_displayColumns);
displayColumnsCheckBox.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
_displayColumns = displayColumnsCheckBox.isSelected();
refreshGraph();
}