private void Minimize_Click(object sender, RoutedEventArgs e)
            => WindowState = WindowState.Minimized;

        private void Maximize_Click(object sender, RoutedEventArgs e)
            => WindowState = (WindowState == WindowState.Maximized) ? WindowState.Normal : WindowState.Maximized;

        private void Close_Click(object sender, RoutedEventArgs e)
            => Close();
        // タイトルバーのドラッグ移動用イベントハンドラを追加
        private void TitleBar_DragArea_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (e.ButtonState == MouseButtonState.Pressed)
            {
                this.DragMove();
            }
        }
    }