code: public void setNeedleColor(final Color COLOR) {
          if (null == needleColor) {
              _needleColor = COLOR;
              fireUpdateEvent(REDRAW_EVENT);
          } else {
              needleColor.set(COLOR);
          }
      }
docs: Defines the color that will be used to colorize the needle of
  the radial gauges.
  
  @param COLOR