text: should see the prompt Start new thread indicating the functionality of this icon. Make sure NamedPizza is 
  still selected and then click on the icon to start a new thread. This will bring up a window titled Edit 
  where you can begin a new thread. Type something like: We need a subclass of NamedPizza called 
  ChicagoPizza. It should have an axiom that requires it to have a DeepPanBase. Then hit the OK button. 
  Your UI should look similar to figure 12.4. 