page.js

var PaginatedExtended = PaginatedState.extend(function(self, name, opts) {
    PaginatedState.call(self, name, opts);

    self.choices.try_again = 'Try again';

    self.on('state:input', function(e) {
        var content = (e.content || '').trim();
        var choice = self._current_choices[+content - 1];

        if (choice == 'try_again') {
            // DO STUFF HERE
        }
    });

    var super_determine_choices = self._determine_choices;

    self._determine_choices = function(first, last) {
        var choices = super_determine_choices(first, last);
        choices.push('try_again');
        return choices;
    };
});