code: public void itemStateChangedHandler(ItemEvent e) {
  		String valueName = (String) controlToValueName.get(e.getSource());
  		LinearInterpolator value = (LinearInterpolator) valueMap.get(valueName);
  
  		if (e.getStateChange() == ItemEvent.SELECTED) {
  			value.setActive(true);
  			editor.registerValue(value, valueName);
  		} else {
  			value.setActive(false);
  			editor.removeValue(valueName);
  		}
  	}
docs: Notificaiton that one of the configuration option has changed state
  
  @param e The event describing the change of state