private void Button_Click(object sender, RoutedEventArgs e)
        {
            int           index = -1;
            AddUnitWindow au    = new AddUnitWindow(index);

            this.Close();
            au.Show();
        }
        private void AddUnit_Click(object sender, RoutedEventArgs e)
        {
            Window addUnitWindow = new AddUnitWindow(currentHost);

            addUnitWindow.Show();
        }