Working between two stacks

[Glen Bojsza]

After some time of troubleshooting my application I realized that I
had made an assumption how information flows between two stacks.

In stack "build" I have a button that does several calculations and at
one point opens another stack where the user is to determine what
parameters they want to include.

STACK "BUILD"

on mouseUP
-- do calcs
...
...
modal stack "Input"
--do more calcs based on user selection from modal stack "Input" 
...
end mouseUp



My problem is obvious now ... the mouseUp in STACK "BUILD" continues
not waiting for the user input from the STACK "Input"

What would be the proper way to handle communication between stacks so
it will wait for the input decisions?

thanks,