I am trying to fade a text box within specified time. This code works on Windows Phone but it doesn't work in a Windows 8 application. I made changes to fix as many errors as possible. but I couldn't resolve one of them: cannot implicitly convert type 'System.EventHandler' to 'System.EventHandler<object>" arises on the expression sb.Completed += ehl. The full function is below:

    public static void Fade(UIElement target, double ValueFrom, double ValueTo, double Duration)
    {
        DoubleAnimation da = new DoubleAnimation();
        da.From = ValueFrom;
        da.To = ValueTo;
        da.Duration = TimeSpan.FromSeconds(Duration);
        da.AutoReverse = false;

        Windows.UI.Xaml.Media.Animation.Storyboard.SetTargetProperty(da, "opacity");

        Windows.UI.Xaml.Media.Animation.Storyboard.SetTarget(da, target);

        Windows.UI.Xaml.Media.Animation.Storyboard sb = new Windows.UI.Xaml.Media.Animation.Storyboard();
        sb.Children.Add(da);

        EventHandler ehl = null;
        ehl = (s, args) =>
        {

            sb.Stop();
            sb.Completed+= ehl; //error occurs here
            target.Opacity = ValueTo;
        };
        sb.Completed += ehl; //error occurs here

        sb.Begin();
    }