private void PlusButton_Click(object sender, RoutedEventArgs e)
        {
            Log.WriteLine(sender.GetType().Name);

            if (_openCsvFile)
            {
                return;
            }

            ContactList.UnselectAll();
            this.CurrentEntry = new Contact();

            ResetFields();
            ResetMessage();

            GivenName.Focus();

            EnableButton("MinusButton", false);
        }