Can't successfully copy button from .rui to default

Exactly what I feel as well.
I gave all to find out:

I meant to say that I don’t want to know everything about the internal logic of the system.
My expectation is a well working system that doesn’t need to be explained.

Not so easy when I don’t know how to explain it to myself.
A little support from the system creators would help.
Shouldn’t be a problem if the system is considered as a well working solution.