return null;
return new Icon() { public int getIconHeight() { return 12; } public int getIconWidth() { return 12; } public void paintIcon(Component c, Graphics g, int x, int y) { UIDefaults defaults; defaults = UIManager.getLookAndFeelDefaults(); Color hi = defaults.getColor("RadioButton.highlight"); Color low = defaults.getColor("RadioButton.darkShadow"); Color sel = defaults.getColor("RadioButton.foreground"); Color dim = defaults.getColor("RadioButton.shadow");  if (c instanceof AbstractButton) { AbstractButton b = (AbstractButton) c; Color saved = g.getColor(); if (b.isEnabled()) { g.setColor(low); g.drawOval(x, y, 12, 12); g.setColor(hi); g.drawOval(x+1, y+1, 12, 12); if (b.isSelected()) { g.setColor(sel); g.fillOval(x+4, y+4, 6, 6); } } else { g.setColor(hi); g.drawOval(x, y, 12, 12); if (b.isSelected()) g.fillOval(x+4, y+4, 6, 6); } g.setColor(saved); } } };
  public static Icon getRadioButtonIcon()  {    return null;  }