How to use showpanel

Hello,

I would like on the bOS iOS client to be able to run a program AND open another panel while pressing a button. 

Since a button can only perform one task (?), I built a program that is triggered by this button, and at the end of the program I'm having a "showpanel" command to open the other panel. 

However, the panel doesn't show.

What did I do wrong ? Is there something I'm missing about the showpanel command ? 

Is there a better / easier way to do what I would like to do ? 

Thanks,

François