DropShadow Documentation for use in C# code

[jhwheuer]

So I am deprecating the old DropShadowPanel in favor of the the AttachedDropShadow Effect.

Only, I am doing it in C# code, not XAML, as my users can place shapes on a canvas arbitrarily. So I do not have a pre-designed XAML element to attach the DropShadow to...

Running this code does not produce a shadow.:

public static void InitShadow(FrameworkElement e, float blurRadius, float opacity, Vector3 offset, Windows.UI.Color color)
        {
            if (e != null)
            {
                AttachedDropShadow shadow = new AttachedDropShadow()
                {
                    Opacity = opacity,
                    BlurRadius = blurRadius,
                    Offset = offset.ToString(),
                    Color = color,
                    IsMasked = true
                };

                e.SetValue(Effects.ShadowProperty, shadow);
            }
        }

The shapes can be irregular (e.g. a partially transparent bitmap) so that DropShadow needs to be able to deal with that...

When this code is run, the shape is already attached to and positioned on a Canvas.

Any way you could expand the XAML-only documentation for us struggling C# folks?