/// <summary>
/// Animation to flip and fade out a page to the left
/// </summary>
/// <param name="page">The page to animate</param>
/// <param name="seconds">The time of the animation</param>
/// <returns></returns>
public static async Task FlipAndFadeOut(this Page page, float flipSeconds)
{
// Creates the storyboard
var sb = new Storyboard();
// Add flip out animation on the horizontal line
sb.AddFlipOutX(flipSeconds, -120);
// Add flip out animation on the vertical line
sb.AddFlipOutY(flipSeconds, -120);
// Add fade out animation
sb.AddFadeOut(flipSeconds);
// Start animating
sb.Begin(page);
// Make page visible
page.Visibility = Visibility.Visible;
// Wait for it to finish
await Task.Delay((int)(flipSeconds * 1000));
}