public void CalculateTotals()
        {
            // Dont calculate when initializing due to performance
            if (Initializing)
            {
                return;
            }

            DateColumns.CalculateTotals();
            OnPropertyChanged(() => DateTotals);
            OnPropertyChanged(() => DateTotalsSum);
        }
 public bool HasDateColumns()
 {
     return(DateColumns.Any());
 }