Adding record with controls bound in code

[Greg]

Binding Manager & dataset - won't add record
I've got an untyped dataset with controls bound through code. The user
can select a question number from a bound combobox, and the question
number and question text are displayed in bound textboxes. This part
works fine.
When I go to add a new record, the textboxes clear as they should. I
enter a new question number and tab to the textbox for the question
text. At this point, the text for the previously selected question
(whose number is still displayed in the combobox) reappears. If I then
change the text anyway and try to save, it tries to update the
previously selected record instead of adding a new one. I think it has
something to do with the position of the datset not being changed,
although the bindingmanagerbase position is. This code is almost
directly from chapter 6 in Murach's book, VB.Net database programming
with ado.net. Thanks for any help.

Private Sub BindControls()
Try
txtQuestion.DataBindings.Add("Text", dsQuestion.Tables _
("QS"), "QText")
txtQuNum.DataBindings.Add("Text", dsQuestion.Tables _
("QS"), "Q#")
cboQuNum.DataSource = dsQuestion.Tables("QS")
cboQuNum.DisplayMember = "Q#"
Catch ex As Exception
MessageBox.Show(ex.Message, "Binding Controls")
End Try
End Sub

Private Sub btnAdd_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnAdd.Click
Try
bmbQuestion.AddNew()
SetButtons(False)
btnSave.Enabled = False
blnNewRow = True
txtQuestion.Clear()
txtQuNum.Clear()
txtQuNum.Focus()
Catch ex As Exception
MessageBox.Show(ex.Message, "Error Adding Record")
End Try
End Sub

Private Sub cboQuNum_SelectedIndexChanged(ByVal sender As
System.Object, _
ByVal e As System.EventArgs) Handles
cboQuNum.SelectedIndexChanged
If Not blnLoading Then
bmbQuestion.Position = cboQuNum.SelectedIndex
SetButtons(True)
btnSave.Enabled = dsQuestion.HasChanges
txtQuNum.Focus()
End If
End Sub