Hi,

The arrow is a product of the ActiveRow. Selection and the selected row(s) has no bearing.

So what's probably happening here is this line of code is failing:

RotationPersonnelGrid.ActiveRow = row;

I don't think you can do this inside of BeforeCellUpdate. The grid is in the middle of the process of updating a cell in the current row and moving to another row would cause the current row to be updated again. So this line of code is most likely being ignored.

What you would have to do is wait for the current update operation to complete and then set the ActiveRow. Normally, I would say set a flag inside this event and then use some later event like AfterRowUpdate to set the ActiveRow. But since you are cancelling the cell update here, you probably won't even get an AfterRowUpdate. And there's no event for after the cell/row update is cancelled.

So maybe you could try introducing a delay using BeginInvoke. I tried this out in a very simple proof-of-concept scenario and it seems to work for me.

        void ultraGrid1_BeforeCellUpdate(object sender, BeforeCellUpdateEventArgs e)
        {
            if (e.Cell.Text == "A")
            {
                e.Cancel = true;

                UltraGridRow row = this.ultraGrid1.Rows[0];
                
                // This does not work. 
                //this.ultraGrid1.ActiveRow = row;

                // This works
                this.ultraGrid1.BeginInvoke(new RowDelegate(this.SetActiveRow), new object[] { row });
            }
        }

        private delegate void RowDelegate(UltraGridRow row);

        private void SetActiveRow(UltraGridRow row)
        {
            this.ultraGrid1.ActiveRow = row;
        }