Custom Formatter Infragistics Ultragrid

public partial class Form1 : Form
{
    #region FORMATTER

    class AddSecs : IFormatProvider, ICustomFormatter
    {
        public object GetFormat(Type formatType)
        {
            if (formatType == typeof(ICustomFormatter))
                return this;
            else
                return null;
        }

        public string Format(string format, object arg, IFormatProvider formatProvider)
        {
            if (arg is int)
            {
                return arg.ToString() + " SECS";
            }
            else
                throw new ArgumentException();
        }
    }

    #endregion

    public Form1()
    {
        InitializeComponent();
        this.ultraGrid1.InitializeLayout += new Infragistics.Win.UltraWinGrid.InitializeLayoutEventHandler(ultraGrid1_InitializeLayout);
    }

    protected override void OnShown(EventArgs e)
    {
        base.OnShown(e);

        // fill the grid
        Random rand = new Random();
        DataTable dt = new DataTable();

        dt.Columns.Add("COLUMN_A", typeof(int));

        for (int i = 0; i < 20; i++)
            dt.Rows.Add(rand.Next(1, 100));
        dt.AcceptChanges();

        BindingSource src = new BindingSource(dt, null);

        this.ultraGrid1.DataSource = src;
    }

    void ultraGrid1_InitializeLayout(object sender, Infragistics.Win.UltraWinGrid.InitializeLayoutEventArgs e)
    {
        e.Layout.Bands[0].Columns[0].Format = "####";
        e.Layout.Bands[0].Columns[0].FormatInfo = new AddSecs();
    }
}