I cannot get nested UltraGridGroupByRow SummaryValues, they always return null, zero, or an empty string.

Grid setup:

It has OutlookStyle grouping

ColumnA and ColumnB are being grouped, with ColumnA being the outter most grouping and ColumnB is a nested group within ColumnA.

Both ColumnA and ColumnB have summary values, there is also a third column (ColumnC) that also has a summary value

If I use:

UltraGridGroupByRow gbr = (UltraGridGroupByRow UltraGrid.Rows[0];
gbr.Rows.SummaryValues["ColumnC"].Value;

 I correctly get the summary value for ColumnC at ColumnA grouping.

If I try to go to ColumnB's grouping level by using this syntax:

UltraGridGroupByRow gbr = (UltraGridGroupByRow)UltraGrid.Rows[0];
UltraGridGroupByRow gbr2 = (UltraGridGroupByRow) gbr.Rows[0];
gbr2.Rows.SummaryValues["ColumnC"].Value;

the Value is null, zero, or an empty string and I know for sure that at ColumnB's grouping level, ColumnC has a summary value that is not null. Please advise.

Thanks,

Dat