如何制作键盘快捷键以关闭Xcode / Interface Builder的对话框？

This seems awfully basic but here goes. If you are keyboard-oriented you get used to using Command-W to close windows all the time in OS X. I'd like to add that capability to the dialogs I am creating in Interface Builder for my program. I can see how to add a keyboard equivalent to a button action but what if I don't have a button?This seems awfully basic but here goes. If you