code: function(ordinal, object) {
          var node, ord, idx, lastIndex = this.cellCount() - 1;
          idx = ordinal > lastIndex ? lastIndex : ordinal;
          while(true) {
              node = this._cellNodes[idx];
              ord = this._getCellOrdinal(node);
              if (ord === ordinal) return this.getByIndex(idx, object);
              else
              if (ord > ordinal) idx--;
              else return null;
          }
      }
docs: Get a cell by its logical index.
  @method getByOrdinal
  @param {int} ordinal - the ordinal number of the cell to retrieve.
  @param {object} object - optional. An object to copy the properties of the specified cell to. If omitted, a new object will be returned instead.
  @return {object} An object that represents the cell.