Thank You.
I was working in Blend, so I was looking for blend tile this, blend tile that, etc. As I said, I'm not a programmer, just learning as a hobby. So obviously Blend's graphical approach to making GUIs is very appealing, compared to writing xaml. Just goes to show you, I guess. :)
For anyone else wondering. I set the properties for Tile in XAML. The important ones:
Viewport="0,0,25,25"
ViewportUnits="Absolute"
The info is here:
TileBrush.Viewport Property[
^]
Scroll down to "Relative and absolute ViewportUnits".
Just out of curiosity, how the hell do I do that in "pure properties-like" blend, if it's even possible?