if (closeButton != null) closeButton.setIcon(closeIcon); if (iconButton != null) iconButton.setIcon(iconIcon); if (maxButton != null) maxButton.setIcon(maxIcon);
  protected void setButtonIcons()  {    if (closeButton != null)    closeButton.setIcon(closeIcon);    if (iconButton != null)    iconButton.setIcon(iconIcon);    if (maxButton != null)    maxButton.setIcon(maxIcon);  }