Hi, I'm very new to Mac programming and this is my first hair-pulling problem..

So please help
I created a cocoa document-based application in Xcode, and opened MainMenu.nib in IB. I want to add a new menu item, say, "show drawer", that sends showDrawer: action to FirstResponder. However, IB has a fixed list of messages understood by First Responder, from which I must pick one. How do I add showDrawer: action to the Target/Action pane of First Responder?
Thanks very much!