WPF - ImageBrush with PNG, not respecting alpha-channel

Question

I want to use an imagebrush to use in the Rectangle.Fill. The file is a .PNG. It comes out looking like it is sitting on a little gray pad. The image brush is returned from a converter with something like this.

            BitmapImage image = new BitmapImage(new Uri(fileName));
        ImageBrush imageBrush = new ImageBrush();
        imageBrush.ImageSource = image;

Answer 1

I was using this in a UserControl and it is either the UserControl or the Grid (that the rectangle sits in that is not transparent. The image\imagebrush is fine.