Styling af en dropdowlist i datagrid

Jeg vil lave nogle styles på mine dropdownlist'er i et datagrid.
Her er koden indtil videre, men den laver ikke noget som helst.

Public Function PopulateList() As DataSet
        Dim myConnection As SqlConnection = New SqlConnection(ConfigurationSettings.AppSettings("Conn"))
        Dim ad As New SqlDataAdapter("SELECT Name,TreeOrder,Levelorder FROM tMenuTree WHERE TreeOrder > 10 ORDER BY TreeOrder ASC", myConnection)
        Dim ds As New DataSet

        ad.Fill(ds, "ItemList")

        Try
            Dim i As Integer
            For i = 0 To ds.Tables(0).Rows.Count - 1
                ddItem.Items(i).Attributes.Add("style", "padding-left:" & (ds.Tables(0).Rows(i).Item(2) * 3).ToString & "px;")
            Next
        Catch ex As Exception
            Response.Write(ex.ToString & "<br>")
        End Try

        Return ds
    End Function

Kan nogen hjælpe mig.