Openvpn + Comodo Firewall ( VPN kill Switch )

Hi, I would to know which among this two would be a nice and more efficient way to configure a comodo firewall as a VPN kill switch for an Openvpn…

https://support.nvpn.net/index.php?/Knowledgebase/Article/View/404/0/how-to-prevent-an-ip-leak-with-comodo-firewall

https://support.hidemyass.com/entries/25039558-Comodo-Firewall-allow-apps-to-only-work-via-OpenVPN

Any, help would be greatly appreciated…