Icon icon = UIManager.getIcon("InternalFrame.closeIcon"); if (icon != null) closeButton.setIcon(icon); icon = UIManager.getIcon("InternalFrame.iconifyIcon"); if (icon != null) iconButton.setIcon(icon); icon = UIManager.getIcon("InternalFrame.maximizeIcon"); if (icon != null) maxButton.setIcon(icon);
  protected void setButtonIcons()  {  }