Each field is named "pFlex" with a number after the field name (e.g.: pFlex1, pFlex2, pFlex3... and goes to pFlex153).
Yeah, quite simple to achieve...
for (var i=1; i<=153; i++)
this.getField("pFlex"+i).display = display.hidden;
Wow, I can't believe it was that simple. Works Great!
Thank you for the quick response and solution.
If you need to do this in the future, it can be even simpler and execute faster if you use hierarchical field naming like: pFlex.1, pFlex.2,...,pFlex.153
// Hide all of the pFlex fields
getField("pFlex").display = display.hidden;