woof_print_html_type_{type}Using by extensions to draw self on the frontIts enough just in init of an extension write next code:PHP add_action('woof_print_html_type_' . $this->html_type, array($this, 'print_html_type'), 10, 1);1add_action('woof_print_html_type_' . $this->html_type, array($this, 'print_html_type'), 10, 1);Look code of by_author for example