Group owner needs email indicating new member sign up?

I am new to OG and am working on my first paid site that uses OG. I think I understand everything but the notification system is driving me crazy. Messaging /Notifications and Actions and triggers are swirling around in my head and yes they are driving me crazy!

It seems that Organic Groups does not come with a trigger to send an email to the group owner when a new member signs up for a group and needs approval. (I have figured out how to send an email once the group owner approves the member) So can someone tell me how to set up this trigger.

Under the argument configuration I see - "Acting user" and "user that subscribed to the group" but not "group owner"

Suggestions?

Richard
http://www.MyLittlePortal.com