Why can't I set the background color of a selected ListBoxItem in WPF?

Question

When a user clicks on an ListBoxItem, I want to it to be a bold larger font red background yellow

Everything works except the background. It seems that there is a st

Answer 1

It can be done a lot simpler. The Background color for the selected ListBox items are taken from the SystemColors. So, what you need to do is override the SystemColors in the Resources of your ListBox: