void onSelectionChanged() {
int i = list.list.getSelectedIndex();
SupaplexLevel level = model.getLevel(i);
levelOptions.setLevel(level);
levelComponent.setLevel(level);
model.setSelectedLevelIndex(i);
}
JPanel createLevelPanel() {
JPanel p = new JPanel(new BorderLayout());
JScrollPane sp = new JScrollPane(levelComponent);
sp.setPreferredSize(new Dimension(400, 300));
p.add(sp, BorderLayout.CENTER);
JPanel p1 = new JPanel(new BorderLayout());
p.add(p1, BorderLayout.SOUTH);
JPanel p2 = new JPanel(new BorderLayout());
JComponent oc = levelOptions.createPanel();
p2.add(oc, BorderLayout.NORTH);
p2.add(new JPanel(), BorderLayout.CENTER);
p1.add(p2, BorderLayout.CENTER);
JComponent pc = palette.createPanel();
p1.add(pc, BorderLayout.EAST);
return p;
}