Detecting when a door is closed?

[GraphicsKid]

There's a part in my level where there's a monster lurking around, and you have to lure it into a cell-block and lock it in. When the cell block is sealed, I want the monster to come running at the door and start beating on it so the player has to barricade it. How can I detect when the door has been shut?

I assume there's a callback type for this... is there a list of these things somewhere? Or is it just the 3 in the editor tooltip: OnPickup, Break, OnIgnite.