JPanel panel = new JPanel(new GridLayout(5, 1, 5, 5));
TitledBorder titledBorder = BorderFactory.createTitledBorder("Difficult examples");
titledBorder.setTitleColor(TangoColorFactory.SCARLET_3);
panel.setBorder(BorderFactory.createCompoundBorder(titledBorder,
BorderFactory.createEmptyBorder(5, 5, 5, 5)));
panel.add(createExampleButton(new ExaminationApp()));
panel.add(createExampleButton(new NurseRosteringApp()));
panel.add(createExampleButton(new TravelingTournamentApp()));
panel.add(createExampleButton(new CheapTimeApp()));
panel.add(new JPanel());
return panel;