protected function configureShowFields(ShowMapper $showMapper)
 {
     $showMapper->with('tabs.client.basic_data');
     $showMapper->add('enabled', null, array('label' => 'client.enabled'));
     $showMapper->add('name', null, array('label' => 'client.name'));
     $showMapper->add('email', null, array('label' => 'client.email'));
     $showMapper->add('phone', null, array('label' => 'client.phone'));
     $showMapper->end();
     $showMapper->with('tabs.client.invoice_data');
     $showMapper->add('invoice_name', null, array('label' => 'client.invoice_name'));
     $showMapper->add('invoice_nip', null, array('label' => 'client.invoice_nip'));
     $showMapper->add('invoice_address', null, array('label' => 'client.invoice_address'));
 }