In this article a scrollbar gets a new look. There is a line in the style which appears to put the triangle in the scroll buttons. I don’t know how to read it though.
Content="M 0 0 L 4 4 L 8 0 Z"/>
What does that mean in the context of the control?
It’s just the geometry for the Path Data. If you’d like to reproduce it just do something like
<Path Data="YourPath"/>Hope this helps.