Admin\Form\Post\EditDefinition::define PHP Method

    public function define(Form $form)
    {
        // Basic fieldset
        $form->wrap('basic', null, function (Form $form) {
            // ID
            $form->add('id', new Field\HiddenField());
            // Title
            $form->add('title', new Field\TextField())->label(Translator::translate('admin.post.field.title'))->setFilter('trim')->required(true);
            // Alias
            $form->add('alias', new Field\TextField())->label(Translator::translate('admin.post.field.alias'));
            // Images
            $form->add('images', new Field\TextField())->label(Translator::translate('admin.post.field.images'));
            // URL
            $form->add('url', new Field\TextField())->label(Translator::translate('admin.post.field.url'))->setValidator(new Rule\UrlValidator())->set('class', 'validate-url');
            // Example: Post List
            $form->add('post_list', new PostListField())->label('List Example');
            // Example: Post Modal
            $form->add('post_modal', new PostModalField())->label('Modal Example');
        });
        // Text Fieldset
        $form->wrap('text', null, function (Form $form) {
            // Introtext
            $form->add('introtext', new Field\TextareaField())->label(Translator::translate('admin.post.field.introtext'))->set('rows', 10);
            // Fulltext
            $form->add('fulltext', new Field\TextareaField())->label(Translator::translate('admin.post.field.fulltext'))->set('rows', 10);
        });
        // Created fieldset
        $form->wrap('created', null, function (Form $form) {
            // State
            $form->add('state', new Field\RadioField())->label(Translator::translate('admin.post.field.state'))->set('class', 'btn-group')->set('default', 1)->addOption(new Option(Translator::translate('phoenix.grid.state.published'), '1'))->addOption(new Option(Translator::translate('phoenix.grid.state.unpublished'), '0'));
            // Version
            $form->add('version', new Field\TextField())->label(Translator::translate('admin.post.field.version'));
            // Created
            $form->add('created', new Phoenix\Field\CalendarField())->label(Translator::translate('admin.post.field.created'));
            // Modified
            $form->add('modified', new Phoenix\Field\CalendarField())->label(Translator::translate('admin.post.field.modified'));
            // Author
            $form->add('created_by', new Field\TextField())->label(Translator::translate('admin.post.field.author'));
            // Modified User
            $form->add('modified_by', new Field\TextField())->label(Translator::translate('admin.post.field.modifiedby'));
        });
    }