code: function() {
      var selectedCells = Dom.getElementsByClassName(DT.CLASS_SELECTED,"td",this._elTbody);
      Dom.removeClass(selectedCells, DT.CLASS_SELECTED);
  }
docs: Convenience method to remove the class YAHOO.widget.DataTable.CLASS_SELECTED
  from all TD elements in the internal tracker.
  
  @method _unselectAllTdEls
  @private