diff --git a/ui.py b/ui.py
index 1bf3a60..3f6ce98 100755
--- a/ui.py
+++ b/ui.py
@@ -30,10 +30,20 @@ class App:
     '''
 
     def __init__(self, master=None, *canvas_args, **canvas_kw):
-        frame = self.frame = Frame(root, background='green')
+        notebook = self.notebook = Notebook(master)
+        notebook.enable_traversal()
+
+        frame = self.frame = Frame(None, background='green')
+        # When putting a frame into a Notebook you use the add() method.
+        # but what should the parent of the frame be?  The Notebook?
+
         frame.rowconfigure(0, weight=1)
         frame.columnconfigure(0, weight=1)
-        frame.pack(expand=True, fill=BOTH)
+
+        # When putting a frame into a Notebook you evidently don't need
+        # to pack() it.  Maybe because of the weights?  I'm not setting
+        # the sticky arg to Notebook.add().
+        #frame.pack(expand=True, fill=BOTH)
 
         canvas = self.canvas = Canvas(frame, *canvas_args, **canvas_kw)
 
@@ -57,6 +67,9 @@ class App:
 
         canvas.bind("<Configure>", self.handle_canvas_resize)
 
+        notebook.add(frame, text='Star Map', underline=5)
+        notebook.pack(expand=True, fill=BOTH)
+
     def handle_canvas_resize(self, event):
         print(event)