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DataGridView loses data I added to an added column!

Am I being dumb? I read a XML file into a DataGridView...

Code:

Dim oDSet = New System.Data.DataSet
oDSet.ReadXml(strFilePath)
DataGridView1.DataSource = oDSet.Tables(0)

The XML file contents show in the grid OK.
I iterate through the rows, and if there's bad data in the row I set the colour to red, and add a value to what would end up as a hidden new column, with the intention of sorting later to show all the error rows together.

Code:

        DataGridView1.Columns.Add("test1", "Errors")
        For Each drow As System.Windows.Forms.DataGridViewRow In DataGridView1.Rows
            If drow.Cells("Whatever").Value.ToString = "Wrong" Then
                DataGridView1.Rows(drow.Index).DefaultCellStyle.BackColor = Color.Red
                DataGridView1.Rows(drow.Index).Cells("test1").Value = "ERR"
            End If
        Next

It sort of works, although I've found that I can't sort easily on a non-data-bound new column. :p

My question is, though, if I click on a column heading to sort, all my red changes - and new values in the new test1/"Errors" column - all vanish!
Why is that, and how do I actually achieve this? :)
Thanks

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