title: FXRuby intercept window close
body: <p>I've created a 'confirm exit' dialog box to prompt the user when exiting. I've successfully connected it to an 'exit' menu command, but I also want to connect it to the window-close (X) button. How can I do this? I've had some experience with Java Swing, and to accomplish this task you had to add a window listener to the frame that would call this prompt. Is there something similar I must do here?</p>