Atttach Event handler to code added combobox how ?

[Dave]

I added a combobox to my grid via the following method
   GridViewComboBoxColumn cboreason = new GridViewComboBoxColumn("Reasons");
               
               cboreason.DataSource = pamsContext.GetGrievancesReasons();
               cboreason.FieldName = "reason";
               cboreason.DisplayMember = "Value";
               cboreason.ValueMember = "Key";
               cboreason.Width = 100;
               grvGrievances.Columns.Add(cboreason);
               grvGrievances.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
     

 I have a details changed to track the dirty state of my form which i normally attach via 
  txtReportedTo.SelectedValueChanged+= DetailsChanged;
             

How do i do this with the above ???? As dont see the usual SelectedValueChanged method to call ??