Is there any news about this issue?Niven Prasetya

Please see the picture and the Demo code.
Environment:VS2008+IE8.0

Thank you,Glenn Layaar.The problem has solved. 

I was mistaken that "Get first cell" by "grid.RootTable.GetRow(curRow).GetCell(1);" in the past.
Now I chang a little code ,it work perfect ：

function wgTest_OnKeyDown(controlId, tblName, rowIndex, cellIndex) {
            var grid = ISGetObject(controlId);
            var totalRows = grid.TotalRows;
            var curRow = grid.GetSelectedObject().rowIndex;
            var curCell = grid.GetActiveEditCell().cellIndex-1;
            var activeCell = grid.GetActiveEditCell();

            if (activeCell.rowElement.type == "Record") {

                if (event.keyCode == 13) {

                    if (curCell == grid.RootTable.Columns.length-1) {                        
                        grid.SetFocus();
                        grid.RootTable.GetRow(curRow + 1).Select();
                        var nextCell1 = grid.RootTable.GetRow(curRow + 1).GetCell(0);
                        nextCell1.ActivateEdit();
                    }
                    else {
                        grid.SetFocus();
                        grid.RootTable.GetRow(curRow).Select();
                        var nextCell = grid.RootTable.GetRow(curRow).GetCell(curCell+1);
                        nextCell.ActivateEdit();
                    }
                }
                return true;
            }
        }

I met the same problem as  Pierre Belanger.But my teamwork has found a solution for it although it seems not very perfect 

MY teamwork has fixed it although it is not very perfect