Pivot Control Black Box
The goal is to change the color of the black border around my Pivot control.
I created a copy of the template for the pivot control so I can modify the style. It isn't obvious how to modify the style to change the color of the this black brush.
Added Border Brush - I looked at BorderBrush but it doesn't really feel like change?
Where and how - to best achieve the changing of a border color? The red dotted boxes are not changing the color.

