svoid <A> comboBoxDynamicToolTip(JComboBox<A> cb, IF1<A, S> makeToolTip) {
  class ComboBoxRendererWithToolTip extends javax.swing.plaf.basic.BasicComboBoxRenderer is javax.swing.plaf.UIResource {
    public Component getListCellRendererComponent(JList list, O value, int index, bool isSelected, bool cellHasFocus) {
      var c = super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
      //printVars(+isSelected, +value, +index);
      if (c cast JComponent && isSelected) pcall {
        c.setToolTipText(makeToolTip?.get((A) value));
      }
      ret c;
    }
  }
  
  cb.setRenderer(new ComboBoxRendererWithToolTip);
}