I have a question.
there is a function "DraftNewsletters" in the newsletter/code/NewsletterType.php.

It returns all the draft newsletters.

I added a similar function to the NewsletterType.php:

function NewslettersArticles() {
    if(!isset($_GET['start']) || !is_numeric($_GET['start']) || (int)$_GET['start'] < 1) $_GET['start'] = 0;
    $SQL_start = (int)$_GET['start'];
      $doSet = DataObject::get(
         $callerClass = "Newsletter",
         $filter = "",
         $sort = "Created DESC",
         $join = "",
         $limit = "{$SQL_start},4"
       );
   
       return $doSet ? $doSet : false;
   }

And I'm showing all the newsletters in my page like this:

<% control NewslettersArticles%>
   <h3><a href="$Link" >$Title</a></h3>   
<p class="entry-date"><strong>Date:</strong> $Created</p>                              
<% end_control %>

Everything works fine.

But I need to add a pager:
I'm using code from the tutorial:

<% if NewslettersArticles.MoreThanOnePage %>
             <p>
             <% if NewslettersArticles.PrevLink %>
               <a href="$NewslettersArticles.PrevLink">&lt;&lt; Prev</a> |
             <% end_if %>
            
             <% control NewslettersArticles.Pages %>
               <% if CurrentBool %>
                <strong>$PageNum</strong>
               <% else %>
                <a href="$Link" title="Go to page $PageNum">$PageNum</a>
               <% end_if %>
             <% end_control %>
            
             <% if NewslettersArticles.NextLink %>
               | <a href="$NewslettersArticles.NextLink">Next &gt;&gt;</a>
             <% end_if %>
             </p>
            <% end_if %>

but it doesn't work.

NewslettersArticles.MoreThanOnePage does not return anything. Why??