get more control on datagrid header (?)

[Manit I]

Dear all,


I add more header's row on runtime using ItemCreate() and add
DataGridItem(0, 0, ListItemType.Header) to get more header row. and assign
value to .text and .ColumnSpan property to custom header.
unfortunately I can't format them as desired to any of standard datagrid
member like .HorizontalAlign or .VerticalAlign and also on my
ItemDataBound() I can't see the newly added header row.

Please suggest,
Regards,