Hmm. Didn't seem to change my result.
If I add the image source line twice though, I get the normal banner, with my marquee over the top of it.
<Image Source="pack://siteoforigin:,,,/Themes/Marquee/Images/Marquee.png" Stretch="Uniform" HorizontalAlignment="Center" VerticalAlignment="Center" RenderOptions.BitmapScalingMode="HighQuality" />
<Image Source="pack://siteoforigin:,,,/Themes/Marquee/Images/Marquee.png" Stretch="Uniform" HorizontalAlignment="Center" VerticalAlignment="Center" RenderOptions.BitmapScalingMode="HighQuality" />
I can work with this - is there a way to disable the transition of the marquee? As I scroll through platforms the image briefly dims due to soft transition.