Max,

>Any thoughts on this one?

First of all, I noticed the Order Detail DataGrid is set to allow entering new records by pressing the down arrow. I've recently changed this (by setting the grid's AddRowsWithDownArrow property to false) because it's best not to add new rows outside the context of a business object.

Also, try changing the code in the btnNewDetail button to the following (you can simply remove the second, btnNewItem button):

Private Sub btnNewDetail_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnNewDetail.Click
    Me.oOrderDetail.NewRow(New OrderDetailDefaultValues(Integer.Parse(Me.txtOrderID.Text)))
    Me.grdOrderDetail.NavigateData(mmNavigate.Last)
    Me.grdOrderDetail.Focus()
End Sub

Regards,