I need to format the result of the total formulas on my grid footers, but can't see how that would work:

mygrid.Bands[0].Columns.FromKey("BILLINGS_AMT").Footer.Formula = "ROUND(SUM([Total]),0)"; 

What I need to be able to do is apply formatting to that resulting total, similar to what I do here on the cells of that column:

e.Row.Cells.FromKey("BILLINGS_AMT").Text = CultureFormatting.FormatNumber(Double.Parse(e.Row.Cells.FromKey("BILLINGS_AMT").Text), 0, CultureInfo.CurrentCulture);