HighlightingStyle with border similar to the selection style

Hi.

I'd like to implement a highlighting style similar to the default selection style. In that style, if the selection spans multiple lines the border is drawn around the outer edge, not on every line.

When I try to add a border to my HighlightingStyle with:

deletedStyle.BorderBrush = new SolidColorBrush(Color.FromRgb(255, 148, 148));

deletedStyle.BorderStyle = HighlightingStyleLineStyle.Solid;

I get a border around every line, not just the outer edge.

Cheers,

Dave