static <A> DefaultListCellRenderer customToStringListCellRenderer(IF1<A, S> toString) {
  ret new DefaultTreeCellRenderer {
    @Override
    public Component getListCellRendererComponent(JList list, O value, int index, bool isSelected, bool cellHasFocus) {
    Component c = super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
    setText(toString.get((A) value));
    ret c;
  };
}