yes, it’s a real monster. But the monster becomes your best friend with bindingexpression.

Thanks a lot for your code snippet.

Nice work! Yep, I ran into this monster too!

In Part 2 of my WPF series: http://www.codeproject.com/KB/WPF/WPFBusinessAppsPartTwo.aspx I ran into this and it drover me nuts until I figured out what was up.

Below is a code snippet from the article. The UpdateFocusedField method is actually place in the base class of the UserControl that hosts all my forms.

Private Sub btnSave_Click(ByVal sender As Object, _
ByVal e As System.Windows.RoutedEventArgs) _
Handles btnSave.Click

UpdateFocusedField()

If _objCustomer.IsValid Then
Me.frmNotification.NotificationMessage = “Customer record saved”
End If

End Sub

Private Sub UpdateFocusedField()

Dim fwE As FrameworkElement = _
TryCast(Keyboard.FocusedElement, FrameworkElement)

If fwE IsNot Nothing Then

Dim expression As BindingExpression = Nothing

If TypeOf fwE Is TextBox Then
expression = fwE.GetBindingExpression(TextBox.TextProperty)
‘TODO add more controls types here. Won’t be that many.
End If

If expression IsNot Nothing Then
expression.UpdateSource()
End If

End If

End Sub

Cheers,

Karl