Using patches to draw a map and want to do selection as it works on the map here: http://africawatermap.aptivate.org/

This doesn't seem to be possible as the non-selected glyphs are being drawn over the selected glyph. Couple of screenshots to highlight this.

selected and non-selected elements are full alpha, but selected has thick line

non-selected element keeps line alpha but has full alpha set to 0

non-selected element has line_alpha of 0 and fill_alpha of 0.2

non-selected element has line_alpha of 0 and fill_alpha of 1