code: function() {
          this.items = this.element.find('> li').each(function() {
              var self = $(this);
  
              // Cache the initial column width
              self.cache('matrix-column-width', self.outerWidth());
          });
  
          if (this.options.defer) {
              this._deferRender();
          } else {
              this.render();
          }
      }
docs: Fetch new items and re-render the grid.