if (disabledIcon != this.disabledIcon)
if (disabledIcon != newIcon)
  public void setDisabledIcon(Icon disabledIcon)  {    if (disabledIcon != this.disabledIcon)      {	Icon oldDisabledIcon = this.disabledIcon;	this.disabledIcon = disabledIcon;	firePropertyChange(DISABLED_ICON_CHANGED_PROPERTY, oldDisabledIcon,	                   this.disabledIcon);      }  }