titlebar c#

public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();

            var titleBar = ApplicationView.GetForCurrentView().TitleBar;

            titleBar.ButtonBackgroundColor = Colors.Transparent;
            titleBar.ButtonInactiveBackgroundColor = Colors.Transparent;

            var coreTitleBar = CoreApplication.GetCurrentView().TitleBar;
            coreTitleBar.ExtendViewIntoTitleBar = true;
            UpdateTitleBarLayout(coreTitleBar);

            // Set XAML element as a draggable region.
            Window.Current.SetTitleBar(AppTitleBar);

            coreTitleBar.LayoutMetricsChanged += CoreTitleBar_LayoutMetricsChanged;
            coreTitleBar.IsVisibleChanged += CoreTitleBar_IsVisibleChanged;

            Window.Current.Activated += Current_Activated;
        }

        private void CoreTitleBar_LayoutMetricsChanged(CoreApplicationViewTitleBar sender, object args)
        {
            UpdateTitleBarLayout(sender);
        }

        private void UpdateTitleBarLayout(CoreApplicationViewTitleBar coreTitleBar)
        {
            // Update title bar control size as needed to account for system size changes.
            AppTitleBar.Height = coreTitleBar.Height;

            // Ensure the custom title bar does not overlap window caption controls
            Thickness currMargin = AppTitleBar.Margin;
            AppTitleBar.Margin = new Thickness(currMargin.Left, currMargin.Top, coreTitleBar.SystemOverlayRightInset, currMargin.Bottom);
        }

        private void CoreTitleBar_IsVisibleChanged(CoreApplicationViewTitleBar sender, object args)
        {
            if (sender.IsVisible)
            {
                AppTitleBar.Visibility = Visibility.Visible;
            }
            else
            {
                AppTitleBar.Visibility = Visibility.Collapsed;
            }
        }

        private void Current_Activated(object sender, Windows.UI.Core.WindowActivatedEventArgs e)
        {
            SolidColorBrush defaultForegroundBrush = (SolidColorBrush)Application.Current.Resources["TextFillColorPrimaryBrush"];
            SolidColorBrush inactiveForegroundBrush = (SolidColorBrush)Application.Current.Resources["TextFillColorDisabledBrush"];

            if (e.WindowActivationState == Windows.UI.Core.CoreWindowActivationState.Deactivated)
            {
                AppTitle.Foreground = inactiveForegroundBrush;
            }
            else
            {
                AppTitle.Foreground = defaultForegroundBrush;
            }
        }

    }