public App()
{
this.InitializeComponent();
this.Suspending += this.OnSuspending;
pivotHeaderColors = new SolidColorBrush[2];
pivotHeaderColors[0] = new SolidColorBrush(Colors.White);
pivotHeaderColors[1] = new SolidColorBrush(Color.FromArgb(128, 160, 160, 160));
}