adding sub group headers dynamically for datagrid in prerender

[Anand]

problem.. the code creates a header row when i see the rendered hTML
but it is not creating the table cell inside the row. ie. it is
rendering as <tr></tr>
instead of <tr></td> mmmmm </td></tr>

the namevalues[i] is an array which contains all the categories of my
products at respective index position with respect to the grid. The
array is filled while itemdatabound.

below is the code i wrote in pre render..




private void itemsDataGrid_PreRender(object sender, System.EventArgs
e)
{

//Just before the Datagrid renders its output, add the extra
separator rows
DataGrid dg = (DataGrid)sender;

Table tbl = (Table) dg.Controls[0];
DataGridItem dgi;
TableCell cell;

int i;
int iAdded = 0;

for (i=0; i < nameValues.GetUpperBound(0); i++)
{
if (nameValues[i] != DataTypeHelper.NullString && nameValues[i]
!= null)
{
//Just so it picks up the formatting class for my Header, could
have used ListItemType.Item
// dgi = new DataGridItem(0, 0, ListItemType.Header);
dgi = new DataGridItem(5, 5, ListItemType.Header);
cell = new TableCell();
cell.ColumnSpan =7;
cell.Text = nameValues[i];
dgi.Cells.Add(cell);

//Add one to skip past the Header item
// //tbl.Controls.AddAt(i + iAdded + 1, dgi);

itemsDataGrid.Controls[0].Controls.AddAt(i + iAdded + 2, dgi);
iAdded = iAdded + 1;

added = false;
}
}
}
}


any help is greatly appreciated

thanks
anand