Pnotify: buttons not working

I'm trying to use the Pnotify buttons, but I couldn't get them to work. The problem is I am using Pnotify with the required JS and Bower (within the spine). I have tried in different ways.

The pnotify documentation has a comment addressing this issue: ( https://github.com/sciactive/pnotify#using-pnotify-with-requirejs ) this is an example:

requirejs(['pnotify', 'pnotify.nonblock', 'pnotify.desktop'], function(PNotify){
    PNotify.desktop.permission();
    new PNotify({
        title: 'Desktop Notice',
        text: 'If you\'ve given me permission, I\'ll appear as a desktop notification. If you haven\'t, I\'ll still appear as a regular PNotify notice.',
        desktop: {
            desktop: true
        },
        nonblock: {
            nonblock: true
        }
    });
});

      

        
        
        
      

    

This example works for me, so I modified it a bit for my needs:

require(['pnotify', 'pnotify.buttons', 'pnotify.nonblock'], function(PNotify){
            new PNotify({
                title: title ,
                text: msg,
                type: classes,
                delay: delay,
                animation: 'fade',
                opacity: .9,
                nonblock: {
                    nonblock: true,
                    nonblock_opacity: .2
                }
            });
 });

      

        
        
        
      

    

Don't unblocked messages work fine and desktop notifications too (if needed) but buttons not showing ... Anyone had a similar problem? Any ideas? it would be great to find a solution for this. Thank!

NOTE. I already have all pnotify modules installed.