private void cbTowns_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var item = cbTowns.SelectedItem.ToString();

            if (item == "Add New Town...")
            {
                AddTown addTownWindow = new AddTown();
                addTownWindow.ShowDialog();
            }
        }
        private void TownsComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var value = cbTowns.SelectedItem.ToString();

            if (value == "Add New Town...")
            {
                AddTown addTownWindow = new AddTown();
                addTownWindow.Show();
            }
        }