code: func (s *Sheet) maybeAddRow(rowCount int) {
  	if rowCount > s.MaxRow {
  		loopCnt := rowCount - s.MaxRow
  		for i := 0; i < loopCnt; i++ {
  
  			row := &Row{Sheet: s}
  			s.Rows = append(s.Rows, row)
  		}
  		s.MaxRow = rowCount
  	}
  }
docs: // Make sure we always have as many Rows as we do cells.