private void OldVersion_LostFocus(object sender, RoutedEventArgs e)
        {
            if (selectedProjectProduct == null)
            {
                return;
            }
            bool success = ProjectFunctions.AmendOldVersion(selectedProjectProduct, OldVersion.Text, (editMode == ByProject));

            if (success)
            {
                refreshEditPage();
                CommitButton.IsEnabled = true;
            }
            else
            {
                OldVersion.Text = selectedProjectProduct.OldVersion.ToString("#0.0");
            }
        }