WPF TreeViewItem Background

Question

How can I change the Background of a selected TreeViewItem when the TreeView (or the Application) looses Focus. A selected item by def

Answer 1

If you don't want to override the default contol template, you can define your own template for the headers using textblock and apply the style in that template to the textblock itself (there's a small padding in the default control template of TreeViewItem, so you should also set it to zero to achieve pixel-perfection).