function thb_create_slideshows_posttype_config_container($label = '', $slug = 'slideshow_config_container')
 {
     /**
      * Base configuration fields container.
      */
     $thb_container = new THB_MetaboxFieldsContainer('', $slug);
     $field = new THB_NumberField('delay');
     $field->setLabel(__('Delay', 'thb_text_domain'));
     $field->setHelp(__('Expressed in seconds.', 'thb_text_domain'));
     $field->setPlaceholder(__('E.g. 5', 'thb_text_domain'));
     $thb_container->addField($field);
     $field = new THB_NumberField('transition_speed');
     $field->setLabel(__('Transition speed', 'thb_text_domain'));
     $field->setHelp(__('Expressed in seconds.', 'thb_text_domain'));
     $field->setPlaceholder(__('E.g. 1', 'thb_text_domain'));
     $field->setMin('0');
     $field->setStep('0.05');
     $thb_container->addField($field);
     $thb_field = new THB_SelectField('slideshow_type');
     $thb_field->setLabel(__('Type', 'thb_text_domain'));
     $thb_field->setDynamicOptions('thb_slideshows_types');
     $thb_field->setInvisibleIfEmpty(true);
     $thb_container->addField($thb_field);
     return $thb_container;
 }