Hi,

I wasn't sure what the difference was between the two methods, so I created a sample project to take a look at this and handled the BeforePerformAction event of the grid. When you tab, you get an action of NextCellByTab. When you arrow, you get NextCellInBand. So clearly, the difference is between these two actions.

Next, I put in a Debug.Writeline to display the grid.CurrentState. I find that after I tab, then state looks like this:

Cell, CellFirst, InEdit, IsCheckbox, Row

But when I arrow, it looks like this:

Cell, IsCheckbox, Row

So the difference is that the grid is not in edit mode when you use the arrow keys.

There are a number of ways you could change this. You could modify the KeyActionMappings in the grid, for example. But that's probably not the best way to go and it's a bit complicated. So what I would do is this:

        private void ultraGrid1_BeforePerformAction(object sender, Infragistics.Win.UltraWinGrid.BeforeUltraGridPerformActionEventArgs e)
        {
            UltraGrid grid = (UltraGrid)sender;

            // Disable the firing of this event to prevent recursion. 
            grid.EventManager.SetEnabled(GridEventIds.BeforePerformAction, false);

            try
            {
                switch (e.UltraGridAction)
                {
                    case UltraGridAction.NextCellInBand:                        
                    case UltraGridAction.PrevCellInBand:                        
                    case UltraGridAction.BelowCell:                        
                    case UltraGridAction.AboveCell:

                        // Perform the intended action. 
                        grid.PerformAction(e.UltraGridAction);

                        // Enter edit mode. 
                        grid.PerformAction(UltraGridAction.EnterEditMode);

                        // Cancel the action, so the grid doesn't perform it again, since we 
                        // already did it.
                        e.Cancel = true;
                        break;
                }
            }
            finally
            {
                // Re-enabled the event.
                grid.EventManager.SetEnabled(GridEventIds.BeforePerformAction, true);
            }
        }