I am grouping by row a particular field. How can I get the values of the other columns in that groupby row?
You can look at the ChildBands collection of that row, whose rows collection will be all of the rows that are grouped by that particular condition. So to get at, for example, a column named "Col 1" and assuming that the first row in the grid is a GroupByRow, you would have:
UltraGridCell cell = this.ultraGrid1.Rows[0].ChildBands[0].Rows[0].Cells["Col 1"];
-Matt