code: public void setYellowOn(final boolean YELLOW_ON) {
          boolean oldYellowOn = yellowOn;
          yellowOn = YELLOW_ON;
          propertySupport.firePropertyChange(YELLOW_PROPERTY, oldYellowOn, yellowOn);
          repaint(getInnerBounds());
      }
docs: Enables/disables the yellow light
  @param YELLOW_ON