code: public void setKnobType(final KnobType TYPE) {
          if (null == knobType) {
              _knobType = null == TYPE ? KnobType.STANDARD : TYPE;
              fireUpdateEvent(RESIZE_EVENT);
          } else {
              knobType.set(TYPE);
          }
      }
docs: Defines the type of knob that will be used in the radial
  gauges. The values are STANDARD, PLAIN, METAL and FLAT.
  
  @param TYPE