Button to hide Subform or Rectangle

Hi everyone,
 
Two days looking through every conceivable forum and search engine has me clutching at straws. I cannot for the life of me get certain object to become invisible just by the press of a button.
 
Ultimately I will tie this script to something more useful, like when a user selects a certain radio-button selection or an item off a drop down list. But right now, I thought I'd make it real simple and just create a button that would try and hide two things. Neither seem to disappear. What am I missing???
 
My Formcalc Button code is:
 
form1.Subform1.presence = "invisible"
Rectangle1.presence = "invisible"
  
I have one subform with just three textfields and outside of this I also have a Rectangle. That's it. I'd love to attach it but don't know how :S
 
I get no errors when I click the button, but the subform or the rectangle don't disappear either.
 
Many thanks in advance.
Lev