code: function (eventDescriptor) {
          var me = this,
              index = ++me.queueIndex;
  
          // keyframe events are inserted after a keyFrameEvent is played.
          if (me.keyFrameEvents[eventDescriptor.type]) {
              Ext.Array.insert(me.eventQueue, index, [
                  { keyframe: true, ts: eventDescriptor.ts }
              ]);
          }
      }
docs: This method is called after an event has been played to prepare for the next event.
  @param {Object} eventDescriptor The descriptor of the event just played.