How to get the comments displayed?

I am using Advanced Poll v2.08. The code is:

$php_poll->set_template_set("popup");
if ($php_poll->is_valid_poll_id(4)) {
echo $php_poll->display_poll(4);
}

The popup window displays the results but not the "comments". How do I get this implemented? What code changes/additions are required?

Following additional code did notmake any difference.

$php_poll->set_template("poll_comment");
$php_poll->set_comments_per_page(5);
$php_poll->set_date_format("d/m/Y H:i");
$php_poll->data_order_by("time","desc");
echo $php_poll->view_poll_comments(4);
echo $php_poll->get_comment_pages(4);

Any help welcome. Thanks in advance,
Ramesh