public JMenuItem getGenotypeGroupItem() {
JMenuItem item = new JMenuItem("Group By...");
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
(new GroupTracksMenuAction("", 0, IGV.getInstance())).doGroupBy();
}
});
item.setEnabled(AttributeManager.getInstance().getVisibleAttributes().size() > 0);
return item;