Show an element in a reusable element outside of the reusable element onto a page

Need help
1

I wanted to know if it was possible
I have a header which has a button where users can click to show a popup element that’s inside that reusable element
Is there a way outside of the reusable element I can trigger that button click (show element workflow) outside of the reusable element to show the popup element inside of that reusable element?

2

Maybe this can help you.

3

Just use a custom event.