How do I get the ash tray to stay closed?

Ahhhh, stubbing out the cigarette! Sorry to say, back in the day I just flicked the butts out the window, and sometimes the slip stream would circle the burning thing either down my back or into the back seat, where I would eventually smell something burning and have to pull over to douse it. I am really glad I don't smoke anymore.
Well, the good thing is, at least cig butts are biodegradeable, so there's that. lol