[Tkinter-discuss] How to launch a dialog when app is started?

[jepler at unpythonic.net]

You might try writing
    app.after_idle(app.newpage)
or simply:
    app = GuiApplication(Tk())
    app.newpage()
    app.mainloop()
except that this will always enter mainloop after newpage is called,
which may not be what you desire.

Jeff