public function clearAll()
    {
        $this->clearErrors();
        $this->clearWarnings();
        $this->clearProgWarnings();
        $this->clearDebugMessages();
        $this->clearInfos();
        
        unset(self::$session_vars["focus_element"]);
        unset(self::$session_vars["error_element"]);
        unset(self::$session_vars["active_tab"]);
    }