I did a search for Vex Pros toggle button and got a few hits - these 2 both seem to have a program very similar to the Pros one that you have above but with a few minor tweaks. I see you got a solution (GREAT!), but you might run a few tests with those tweaks just to see if you can determine how the methods link together better. If either of the ones below worked, they are so close to being what you had… 
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