void addMenuItem(String label, String command, String currentSelection) {
addMenuItem(delegate, label, command, currentSelection);
}
void addMenuItem(Object targetMenu, String label, String command, String currentSelection) {
MenuItem menuItem;
if (isSelected(command, currentSelection)) {
menuItem = new CheckboxMenuItem(label, true);
} else {
menuItem = new MenuItem(label);
}
menuItem.setActionCommand(command);
menuItem.addActionListener(this);
menuItem.setEnabled(command != null);
((Menu)targetMenu).add(menuItem);
}