Highlight whole TreeViewItem line in WPF

Question

If I set TreeViewItem Background it highlights the header only. How can I highlight the whole line?

I have found a post almost solving a problem http://social.msdn.

Answer 1

Used something like theseven7 to facilitate use of bendewey's code with templated TreeViewItems...

    public static int GetDepth(this TreeViewItem item)
    {
        FrameworkElement elem = item;
        var parent = VisualTreeHelper.GetParent(item);
        var count = 0;
        while (parent != null && !(parent is TreeView))
        {
            var tvi = parent as TreeViewItem;
            if (parent is TreeViewItem)
                count++;
            parent = VisualTreeHelper.GetParent(parent);
        }
        return count;
    }