transparente frame de xamarin form

public static Frame TransparentFrame(double width, double height, Padding padding, Thickness margin)
        {
            Frame frame = new Frame
            {
                BackgroundColor = Color.Transparent,
                WidthRequest = width,
                HeightRequest = height,
                Padding = padding,
                Margin = margin,
                HasShadow = false,
                CornerRadius = 0
            };
            return frame;
        }