If you happen to get stuck on TahDoodle in Chapter 28 and only get the menu bar to show up, here's a solution:
Once you’ve entered in all the code required, you need to connect the Window to File Owner, or else it will only show the menu. Here’s how it works:
Control-click on the word “Window” in your text box then click and drag the dot beside delegate to File’s Owner.
Control-click on the word “Window” in your text box then click and drag the dot beside New Referencing Outlet to File’s Owner and select window.
Launch the program, and click on File -> New.
Hope this helps, it took me way too long to figure this out. There is no mention of it in the book, but if you look carefully at the screenshot on p.193 you can see how the Window outlet settings should be.