code: public void setInteractive(final boolean INTERACTIVE) {
          if (null == interactive) {
              _interactive = INTERACTIVE;
              fireUpdateEvent(INTERACTIVITY_EVENT);
          } else {
              interactive.set(INTERACTIVE);
          }
      }
docs: Defines if the gauge is in interactive mode. This is currently
  implemented in the radial gauges that have a knob. If interactive == true
  the knob can be pressed to trigger something.
  
  @param INTERACTIVE