Progress Bars on other class

When use Progress Bar on console command not problem But I like use on other classes.

I've a command MigrateDatabases.php This command use one clase MigrateTables On this class when try to use progress bars on MigrateTables.php get error

use Illuminate\Support\Facades\Config;
use DB;
...
$bar = $this->output->createProgressBar(DB::connection('mysql_old')->table($db)->count());

When run my console command get error

 php artisan migratedb:migrate table --table=cms_users
                                                          
  [ErrorException]                                           
  Undefined property: Abkrim\Setdart\MigrateTables::$output  

Try read and use some examples of http://symfony.com/doc/2.7/components/console/helpers/progressbar.html but get other error.

I understand $output parameter on ProgressBar constructor.

use Symfony\Component\Console\Helper\ProgressBar;
...
// create a new progress bar (50 units)
$progress = new ProgressBar($output, 50);