I believe that button (rear blind) is an instantaneous "closed while pressed" type.
I'm thinking of using that blank space for an accessory button myself and though the logo is quite appropriate I "think" I may need a "push-on, push-off" latching type, just for a simple (signalling) circuit carrying a very low current.
Are any of the other normal PF buttons better for that function and can you swap the tops over between them? I don't even need any lighting in it.
I've got a rear blind button on its way to me (from A8parts of course) but may need to upgrade the mechanism, depending on the results of further testing - the button with the equipment is a "latching" one but of a hugely inappropriate design, though initial tests do suggest it doesn't really need to latch.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant.
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
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