How in the world do you remove an action in iAd producer?

I am using iAd producer this afternoon to make iAds for some of my apps. I have googled around and for the love of God I cannot figure out how to remove an action that I have added to an action list. I have tried dragging the action out of the list, control clicking, alt clicking, command clicking, I can't figure it out.

How do I delete the action?