var view = ApplicationView.GetForCurrentView();
var coreTitleBar = CoreApplication.GetCurrentView().TitleBar;
coreTitleBar.ExtendViewIntoTitleBar = true;
// active
view.TitleBar.BackgroundColor = Color.FromArgb(255, 8, 87, 180);
view.TitleBar.ForegroundColor = Colors.White;
// inactive
view.TitleBar.InactiveBackgroundColor = Color.FromArgb(255, 8, 87, 180);
view.TitleBar.InactiveForegroundColor = Colors.Black;
// button
view.TitleBar.ButtonBackgroundColor = Color.FromArgb(255, 8, 87, 180);
view.TitleBar.ButtonForegroundColor = Colors.White;
view.TitleBar.ButtonHoverBackgroundColor = Colors.Blue;
view.TitleBar.ButtonHoverForegroundColor = Colors.White;
view.TitleBar.ButtonPressedBackgroundColor = Colors.Blue;
view.TitleBar.ButtonPressedForegroundColor = Colors.White;
view.TitleBar.ButtonInactiveBackgroundColor = Colors.DarkGray;
view.TitleBar.ButtonInactiveForegroundColor = Colors.Gray;