I did a search and found nothing on this. I discovered it by accident.
If you press the top switch ( either up or down ) 1 time quick time, then hold it, BOTH windows will go up or down. I see this listed as a 'feature' of the automatic top switch mod, but mine does not have this mod and it still works every time.
The owners manual somewhat refers to it, but says if you continue to hold the switch in the down position for 2 seconds after the top down cycle finisihes, both windows will go UP.

 

Oh boy something new to try out!

 

I do this after I latch the top down...

 

standard fair on the slk's its in the owners manual

 

I noticed the windows go down when I unlatch the top. Just receintly noticed that the windows go up again if I continue to hold the switch in the top lowering position after hearing the beep.

 

Yes, that is what the owner's manual says will happen.

I was pointing out, however, that without ANY top movement, the windows will go up or down if you press the up/down top switch one quick time, wait one second, then hold it.