Installing Glass in Wood Greenhouse Door

We've build ourselves a greenhouse. The door is a panel door (if that is the correct name). I've taken out the plywood panels top and bottom and have the glass to replace them. On one side of the door the original trim or moulding is intact. It's gone on the other side. My question is - what would be the best way to hold it on that side. So far, I have thought about glazing (the tube stuff - which I've used before on windows) or wood moulding that I'd probably pin nail in place. Any thoughts on this?