Here is where I am getting stuck.
I can't get the following code to work:

Private Sub btnAddDetail_Click(ByVal sender As System.Object, e As System.EventArgs) Handles btnAddDetail.Click
   ' Retrieve the previous Order Detail DataSet
   Dim dsOrderDetail As DataSet = CType(Session("dsOrderDetail"), DataSet)
   
   ' Add a new row to the DataSet
   Me.oOrderDetail.NewRow(dsOrderDetail, Me.oOrderDetail.TableName, New OrderDetailDefaults(Me.OrderID))
   
   ' Store the DataSet back into the session
   Session("dsOrderDetail") = dsOrderDetail
   
   ' Set the new row for editing
   Me.grdOrderDetail.EditIndex = dsOrderDetail.Tables(Me.oOrderDetail.TableName).Rows.Count - 1
   
   ' Rebind the DataGrid
   Me.BindControl(Me.grdOrderDetail)
End Sub

This line is giving me an error saying I have to have 'new' in it.

Me.grdOrderDetail.EditIndex = dsOrderDetail.Tables(Me.oOrderDetail.TableName).Rows.Count - 1

I don't know what the syntax should be.
Thanks.