title: Import page not showing in october cms
body: <p>I'm trying to create an import page as described in this documentation page <a href="https://octobercms.com/docs/backend/import-export" rel="nofollow noreferrer">https://octobercms.com/docs/backend/import-export</a>
  For now i can not see the import page </p>
  
  <p>the import export config file</p>
  
  <pre><code>import:
      title: Import z pliku xsl,xslx
      modelClass: Depcore\Parts\Models\PartImport
      list: $/depcore/parts/models/part/columns.yaml
      redirect: depcore/parts/parts
  
  export:
      title: Eksport części
      modelClass: Depcore\Parts\Models\PartImport
      list: $/depcore/parts/models/part/columns.yaml
      redirect: depcore/parts/parts
  </code></pre>
  
  <p>The Part model</p>
  
  <p>
  
  <p>use Backend\Classes\Controller;
  use BackendMenu;</p>
  
  <pre><code>class Parts extends Controller
  {
      public $implement = ['Backend\Behaviors\ListController','Backend\Behaviors\FormController','Backend\Behaviors\ReorderController','Backend\Behaviors\ImportExportController'];
  
      public $listConfig = 'config_list.yaml';
      public $formConfig = 'config_form.yaml';
      public $reorderConfig = 'config_reorder.yaml';
      public $importExportConfig = 'config_import_export.yaml';
  
      public function __construct()
      {
          parent::__construct();
          BackendMenu::setContext('depcore.parts', 'parts', 'side-menu-item2');
      }
  }
  </code></pre>
  
  <p>The file PartImport.php (made for now as in the documentation)</p>
  
  <pre><code>&lt;?php
  namespace depcore\parts\Models;
  
  class PartImport extends \Backend\Models\ImportModel{
      /**
       * @var array The rules to be applied to the data.
       */
      public $rules = [];
  
      public function importData($results, $sessionKey = null) {
  
        foreach ($results as $row =&gt; $data) {
  
          try {
              // $subscriber = new Subscriber;
              // $subscriber-&gt;fill($data);
              // $subscriber-&gt;save();
  
              // $this-&gt;logCreated();
          }
          catch (\Exception $ex) {
              $this-&gt;logError($row, $ex-&gt;getMessage());
          }
  
        }
      }
  }
  </code></pre>
  
  <p>The import.htm file is exactly as described in the documentation. </p>
  
  <p>Maybe I'm missing something but I cant see the import or export buttons on the toolbar.</p>