@PiBoSo: it would be very very handy to have a bool flag that shows/hide a quad/string.
If the show flag is true, then the quad/string ABGR colour (and sprite) is honoured (i.e. is the quad/string is shown on screen as dictated by the ABGR data).
If the show flag is false, then the quad string is *not* shown on screen, no matter the ABGR data.
Without the flag one has to play with the alpha to show hide stuff, but that's messy.