title: Export a list of users in OctoberCMS to CSV
body: <p>I have read tutorial about using the import and export functionality in OctoberCMS.</p>
  
  <p>But with the <code>rainlab-users</code> plugin, these guidelines don't work. I also tried to install the plugin <code>vojtasvoboda-userimportexport</code>, but it exports all users, not filtered ones.</p>
  
  <pre><code>class Users extends \RainLab\User\Controllers\Users
  {
  
      public $implement = [
          'Backend.Behaviors.FormController',
          'Backend.Behaviors.ListController',
          'Backend.Behaviors.ImportExportController',
      ];
  ....
  }
  </code></pre>
  
  <p>When I added this code into <code>Users.php</code> controller, I got an error: </p>
  
  <blockquote>
    <p>Class .....\User\Controllers\Users has already been extended with Backend\Behaviors\ImportExportController.</p>
  </blockquote>
  
  <p>When I try export without code above, I got error: </p>
  
  <blockquote>
    <p>Call to undefined method October\Rain\Database\QueryBuilder::export()</p>
  </blockquote>