code: function (items) {
          var self = this;
  
          // Force single item into array
          if (!Tools.isArray(items)) {
            if (items instanceof Collection) {
              self.add(items.toArray());
            } else {
              push.call(self, items);
            }
          } else {
            push.apply(self, items);
          }
  
          return self;
        }
docs: Adds new items to the control collection.
  
  @method add
  @param {Array} items Array if items to add to collection.
  @return {tinymce.ui.Collection} Current collection instance.