Balister Height in Formula

[Brandon_Pike]

I am trying to use and if/then statement in formula to specify when a balister gets to a certain height to make elements visible. I added a visibility parameter for the elements and created the formula - it works within the family editor (invisible items show up grayed) but when I insert into my project and use it in a railing, the elements don't appear/disappear as I adjust the height of the railing. Does the Baluster Height instance parameter not directly get its value from whichever rails the top and bottom of the balister are connected to?

Thanks,