title: Main menubar does not show up Tkinter
body: <p>i have problem... my main menubar, which was created by tkinter, does not show up. It's very strange situation, because when i put submenu to window.config(menu=filemenu) [for example], it works fine, but it shows up horizontally (i think like mainmenu should do).</p>
  
  <pre><code>window = tkinter.Tk()
  window.title("SAPC - Scanned Aerial Photographs Correction")
  window.geometry("300x300+300+300")  
  window.iconbitmap(default='favicon.ico') 
  logo1=PIL.Image.open("logo.png")
  logo2 = PIL.ImageTk.PhotoImage(logo1)
  tkinter.Label(window, text="Ver.1.0 Beta")
  tkinter.Label(window,image=logo2).grid(row=0, column=0, columnspan=2, rowspan=2, sticky=tkinter.N+tkinter.E+tkinter.S+tkinter.W) 
  
  menubar=tkinter.Menu(window)
  filemenu = tkinter.Menu(menubar, tearoff=0)
  filemenu.add_command(label="Open", command=window.quit)
  filemenu.add_command(label="Close", command=window.quit)
  
  editmenu = tkinter.Menu(menubar, tearoff=0)
  editmenu.add_command(label="Undo", command=window.quit)
  window.config(menu=menubar)
  window.mainloop()
  </code></pre>