public function onCustomFieldCreateOrEdit(Model $model)
    {
        $this->onList();
        Breadcrumbs::register('customfields-create-update', function($breadcrumbs) use($model) {
            $breadcrumbs->parent('customfields');
            $name = $model->exists ? 'Update custom field ' . $model->name : 'Create custom field';
            $breadcrumbs->push($name, '#');
        });

        view()->share('breadcrumbs', Breadcrumbs::render('customfields-create-update'));
    }