Adding the BO controller to the BO menu

We can add simply an item to the BO menu by adding the $tabs class public array variable to our main module class by following a pattern. In our example, we can add the $tabs variable to the /modules/whcallback/whcallback.php file, inside the class definition, like this:

public $tabs = [
        [
            'name' => [
                'en' => 'Callback Requests',
                'fr' => 'Demandes de rappel'
            ],
            'class_name' => 'AdminWHCallbackRequest',
  ...