I have agrid with an unbound column.  The column is of type string, and is defined inthe grid_init method.  Then in th einit_row I set an initial value, which works.  But then in code I need to change the value, but it does not change.  Can anyone tell me why.  I am sure it is something obvious.

Please see my code below

//From grid_Initialize method

if (!e.Layout.Bands[0].Columns.Exists("Desc"))
{
   e.Layout.Bands[0].Columns.Add("Desc");
}

foreach (var col in e.Layout.Bands[0].Columns)
{
   switch (col.Key)
   {
       case @"Desc":
          col.Header.Caption = "Description";
          col.Header.VisiblePosition = 0;
          col.DataType = Type.GetType("System.String");
          col.DefaultCellValue = "";
          break;

       case PoSModifierItem.UnitCostField:
          col.Header.Caption = "Price"; 
          col.Format = "c";
          col.Header.VisiblePosition = 1;
          break;

       default:
          col.Hidden = true;
          break;
   }
}

private void _ultraGrid1_InitializeRow(object sender, InitializeRowEventArgs e)
{
    e.Row.Cells["Desc"].Value = e.Row.Cells[PoSModifierItem.DescriptionField].Value;
}

private void _cmdApply_Click(object sender, EventArgs e)
{
    foreach (var row in _ultraGrid1.Selected.Rows)
    {
        switch ((int)_txtAdjustment.Value)
        {
            case 0:
                row.Cells["Desc"].Value = row.Cells[PoSModifierItem.DescriptionField].Value;
                break;
            case 1:
                row.Cells["Desc"].SetValue(String.Format("{0}{1}", "Light ", row.Cells[PoSModifierItem.DescriptionField].Value), false);
                break;
        }
    }
}