What tutorial are you following?

What is in @_? Is it not the button and event?

You can always interrogate the event object and find the button that called it, see Gtk2::Entry scroll-event/Re^3: Gtk2::Entry scroll-event, Gtk2-Perl: How to catch shift-clicking of a button?

In reply to Re: GTK2+glade and knowing who called by Anonymous Monk
in thread GTK2+glade and knowing who called by ultibuzz

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