Change selected and unfocused Listbox style to not be grayed out

Question

I have a really simple WPF ListBox with SelectionMode set to Multiple.

When the ListBox loses

Answer 1

A more complete solution would be to have the new brush refer to HighlightColor:

This would ensure that it uses the same color and matches the system theme (even if the system theme changes during runtime, thanks to DynamicResource).

By the way, it seems recent versions of WPF do not use "ControlBrush" for this anymore, but the more appropriate "InactiveSelectionHighlightBrush".