public function fieldset($label, callable $callback){
		if ( $this->unbuffered() ){
			trigger_error("Cannot use Form fieldsets in unbuffered mode", E_USER_ERROR);
		}
		$field = new FormFieldset($this->context, $label, $callback);
		return $this->addField($field);
	}
public function fieldset($label, callable $callback){
		if ( $this->unbuffered() ){
			trigger_error("Cannot use Form fieldsets in unbuffered mode", E_USER_ERROR);
		}
		$field = new FormFieldset($this->context, $label, $callback);
		return $this->addField($field);
	}
public function fieldset ( $ label , callable $ callback ) { if ( $ this -> unbuffered ( ) ) { trigger_error ( "Cannot use Form fieldsets in unbuffered mode" , E_USER_ERROR ) ; } $ field = new FormFieldset ( $ this -> context , $ label , $ callback ) ; return $ this -> addField ( $ field ) ; }
Form fieldset.

@param $callback A new rendering context.
Form fieldset .