That explains it. You have MUCH greater control just by typing the XAML directly. Nobody uses the Properties window to do this, or anything else for that matter. For example:
ImageSource="Images\\Tile.bmp"
Viewport="0,0,.2,.4"
ViewportUnits="RelativeToBoundingBox" />
Asking questions is a skill CodeProject Forum Guidelines Google: C# How to debug code Seriously, go read these articles.
Dave Kreskowiak
