code: function(cellIndex) {
          for (var p=0;p<this.pages.length;++p) {
              var cal = this.pages[p];
              cal.deselectCell(cellIndex);
          }
          return this.getSelectedDates();
      }
docs: Deselects dates in the CalendarGroup based on the cell index provided. This method is used to select cells without having to do a full render. The selected style is applied to the cells directly.
  deselectCell will deselect the cell at the specified index on each displayed Calendar page.
  
  @method deselectCell
  @param {Number} cellIndex The index of the cell to deselect.
  @return {Date[]} Array of JavaScript Date objects representing all individual dates that are currently selected.