@ustk in fact I can do it perfectly from the code but as I assigned about thirty buttons from the property interface, I didn't want to redo everything. I would have thought there would be a solution.
I just thought, what if I want to retrieve the value of the button but from the effect and not from the button c is possible?
yes I only want a single label, indeed it will display the last selected button but that does not pose a problem for me.
the solution to recover the value from the effect can be done