buttontest 2 JHSv1.zip (38.6 KB)
Each Custom Behavior stops the "Main Timeline" of the project (as opposed to the "Main Timeline" of the symbol) for the corresponding Scene (set in the "Scene Inspector").
The "Stop" button in the persistent symbol triggers all three Custom Behaviors.
For Extra Credit:
The code that Mark provided is easily created using Hype's API.
It's actually easy, and it's the right tool for the job.