Hi,

Assuming your column is a string field and it's always exactly 12 characters long, you could do something like this:

        private void ultraGrid1_InitializeLayout(object sender, Infragistics.Win.UltraWinGrid.InitializeLayoutEventArgs e)
        {
            UltraGridLayout layout = e.Layout;
            UltraGridBand band = layout.Bands[0];
            UltraGridOverride ov = layout.Override;

            band.Columns["String 1"].MaskInput = "AAAA-AAAA-AAAA";
            band.Columns["String 1"].MaskDisplayMode = Infragistics.Win.UltraWinMaskedEdit.MaskMode.IncludeBoth;
        }