Hide/show dynamically called VI

[Blokk]

Hello,

I am just playing a bit with UserEvents to setup communications between a main and a dynamically called VI. So far I only used UserEvents for inter-VI communications between parallel loops, and I would like to practice a bit before starting to examine more complex patterns, like the DQMH. 

I just made a small test project, where I start a pop-up VI at starting of the MAIN, but in a hidden state. I would like to ask your opinion about this setup (so in general how to deal with this dynamic call + UserEvents), is it OK as I did, or if you have some better/alternative recommendations?

I feel for a simple pop-up VI which will only hold a XY Graph in a real application with some data visualization options (cursors, etc), I do not really need to start/close every time, I can just hide/show its front panel when needed.

Thanks for your opinion! (Note that, in this test project I skipped to build up a proper error handling strategy.)

 Edit1: when I had to add new Event Refnum to my typedef cluster, I realized I do not see an easy way to totally control the name inside one ref. So for example when I needed a second Boolean UserEvent, I just duplicated the first one inside the cluster, and I gave it a new name. But this does not change the name of the Boolean control inside the reference control. Is there a good practice when we have to modify a typdef cluster in a project holding the UserEvent refums?

[Blokk]

For the previous edit: