private void ShowGoToTopButton()
{
if (isHidden)
{
container.Visibility = Visibility.Visible;
isHidden = false;
var storyboard = new Storyboard();
var animation = new FadeInThemeAnimation();
animation.SetValue(Storyboard.TargetNameProperty, "ScrollToTopButton");
Storyboard.SetTarget(animation, ScrollToTopButton);
storyboard.Children.Add(animation);
storyboard.Begin();
}
}
