code: function (events) {
          var me = this,
              i, event, stateEventsByName;
  
          if (me.stateful && me.getStateId()) {
              if (typeof events == 'string') {
                  events = Array.prototype.slice.call(arguments, 0);
              }
  
              stateEventsByName = me.stateEventsByName || (me.stateEventsByName = {});
  
              for (i = events.length; i--; ) {
                  event = events[i];
  
                  if (!stateEventsByName[event]) {
                      stateEventsByName[event] = 1;
                      me.on(event, me.onStateChange, me);
                  }
              }
          }
      }
docs: Add events that will trigger the state to be saved. If the first argument is an
  array, each element of that array is the name of a state event. Otherwise, each
  argument passed to this method is the name of a state event.
  
  @param {String/String[]} events The event name or an array of event names.