There is four columns in the ultraGrid，and the fourth column is binded with a ultraDropDown, below the is code:

          if (this.ultraGrid1.ActiveCell.Column.Index == 3 && this.ultraGrid1.ActiveCell.Row.Index == this.ultraGrid1.Rows.Count - 1)
                {
                    Infragistics.Win.UltraWinGrid.UltraGridRow row = this.ultraGrid1.ActiveRow;
                    if (row.Cells[0].Value != "" && row.Cells[1].Value != "" && row.Cells[3].Value != "")
                        this.ultraGrid1.Rows.Band.AddNew();
                }

When the current cell is the last row and the last column and the value of column1 column2 and column3 is not empty, then I'd like to add new row.  but I don't know in which event to write the code. I write it in AfterCellUpdate or  AfterCellListCloseUp or  AfterSelectChange. it doesn't work fine.

Many thanks in advance!