Hi,

These are call RowSelectors. They have numbering capability built-in.

So all you have to do is something like this:

        private void ultraGrid1_InitializeLayout(object sender, Infragistics.Win.UltraWinGrid.InitializeLayoutEventArgs e)
        {
            UltraGridLayout layout = e.Layout;         
            UltraGridOverride ov = layout.Override;

            ov.RowSelectorNumberStyle = RowSelectorNumberStyle.RowIndex;
        }