FluentTest.TestWindow.OnBtnClick C# (CSharp) Method

        private void OnBtnClick(object sender, RoutedEventArgs e)
        {
            if (tabGroup1.Visibility == Visibility.Visible)
            {
                tabGroup1.Visibility = Visibility.Collapsed;
                tabGroup2.Visibility = Visibility.Collapsed;
                // tabGroup3.Visibility = System.Windows.Visibility.Collapsed;
            }
            else
            {
                tabGroup1.Visibility = Visibility.Visible;
                tabGroup2.Visibility = Visibility.Visible;
                //tabGroup3.Visibility = System.Windows.Visibility.Visible;
            }

            e.Handled = true;
        }