int h = comp.getPreferredSize().height;
Dimension d = comp.getPreferredSize();
  protected Dimension getDefaultSize()  {    Component comp = DEFAULT_RENDERER.getListCellRendererComponent(listBox,                                                                   " ", -1,                                                                   false,                                                                   false);    currentValuePane.add(comp);    comp.setFont(comboBox.getFont());    int h = comp.getPreferredSize().height;    currentValuePane.remove(comp);    return new Dimension(100, h);  }