code: public void setCustomTickLabelsEnabled(final boolean ENABLED) {
          if (null == customTickLabelsEnabled) {
              _customTickLabelsEnabled = ENABLED;
              fireUpdateEvent(REDRAW_EVENT);
          } else {
              customTickLabelsEnabled.set(ENABLED);
          }
      }
docs: Defines if custom ticklabels should be used instead of the
  automatically calculated ones. This could be useful for gauges
  like a compass where you need "N", "E", "S" and "W" instead of
  numbers.
  
  @param ENABLED