Hello,

I believe you can achieve that using templated columns. In a templated column you can have any content - for example you can start with just a dropdown in the templated column, e.g.

<igtbl:TemplatedColumn>
    <CellTemplate>
        <asp:dropdownlist runat ... />
    </CellTemplate>
</igtbl:TemplatedColumn>

and  then in InitializeRow, you can do something similar to this (pseudo code, just for reference)

TemplatedColumn col = (TemplatedColumn)e.Row.Cells.FromKey("SomeKey").Column;
CellItem ci = (CellItem)col.CellItems[e.Row.Index];
DropDownList dropDown = (DropDownList) ci.FindControl("placeHolder1"); 
if (e.Row.Index == 5)

    dropDown.SelectedIndex = 3;