code: function _setItemOptions(item, options, callback) {
          item.options = {
              show: {
                  transition: this.options.show.transition || this.options.transition,
                  animation: this.options.show.animation || this.options.animation
              },
              hide: {
                  transition: this.options.hide.transition || this.options.transition,
                  animation: this.options.hide.animation || this.options.animation
              },
              transfer: {
                  transition: this.options.transfer.transition || this.options.transition,
                  items: this.options.transfer.items || {},
                  zIndex: this.options.transfer.zIndex,
                  fastResize: this.options.transfer.fastResize
              }
          };
          if (options) {
              item.options.show.transition = (options.show ? options.show.transition : undefined) || options.transition || item.options.show.transition;
              if (options && options.show && (options.show.animation !== undefined)) {
                  item.options.show.animation = options.show.animation;
              }
              else if (options && (options.animation !== undefined)) {
                  item.options.show.animation = options.animation;
              }
              item.options.transfer.transition = (options.transfer ? options.transfer.transition : undefined) || options.transition || item.options.transfer.transition;
              item.options.transfer.items = (options.transfer ? options.transfer.items : undefined) || item.options.transfer.items;
              item.options.transfer.zIndex = (options.transfer && (options.transfer.zIndex !== undefined)) ? options.transfer.zIndex : item.options.transfer.zIndex;
              item.options.transfer.fastResize = (options.transfer && (options.transfer.fastResize !== undefined)) ? options.transfer.fastResize : item.options.transfer.fastResize;
          }
          item.showCallback = function() {
              item.showCallback = undefined;
              item.state = ItemState.VISIBLE;
              _updateState.call(this);
              _endTransferableAnimations.call(this, item);
              item.endSpec = undefined;
              item.startSpec = undefined;
              if (callback) {
                  callback();
              }
          }.bind(this);
      }
docs: Sets the options for an item.