title: Surface ScatterViewItem background not transparent
body: <p>I'm working on a Microsoft Surface and attaching a round image object to a ScatterViewItem.  I'm having an issue hiding the background of the square ScatterViewItem.  If I go in and set the background to transparent, it's not transparent, it's more like gray translucent.  So what I end up with is a round image in the middle sitting on a square with gray translucent edges.  How do I hide this?  I'm doing this programmatically through C#.</p>