Problem with Pass command

[Stgoldberg at aol.com]

Perhaps someone can help with the following problem   I have involving the 
pass command.   I have a button that performs a certain action. A field (it 
could also be another button) overlies the button.   I'd like to arrange so that 
if I click on the field the message passes through it to the button.   How can 
I do this?   I've set the locktext of the field to true and had either no 
script associated with the field or inserted the following script:
on mouseUp
pass mouseUp
end mouseUp

Nothing happens though. How can I get the button to react?   Thanks very 
much.
Steve Goldberg