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sub navbar_callback {
    my ($self, $ht_params, $tmpl_params, $tmpl_file) = @_;
...
        # $tmpl_params->{navbar} = $self->navbar_template;
    }
}

sub setup {
    my $self = shift;
    $self->add_callback( 'load_tmpl' => 'navbar_callback' );
}

sub cgiapp_postrun {
    my ( $self, $outputref ) = @_;
...
        }
    }
}