python - tkinter window title when using class to hold widgets -

i'm trying add window title tkinter application. .title('mytitle') seems work fine on simple examples, not i'm encapsulating widgets in class.

here's simple example using "hello, again" tutorial www.pythonware.com/library/tkinter/introduction/

why not work? thanks!

from tkinter import *  class app:      def __init__(self, master):          frame = frame(master)         frame.pack()          self.button = button(frame, text="quit", fg="red", command=frame.quit)         self.button.pack(side=left)          self.hi_there = button(frame, text="hello", command=self.say_hi)         self.hi_there.pack(side=left)      def say_hi(self):         print "hi there, everyone!"  root = tk()  app = app(root)  root.title('blob')  root.mainloop() 

as per marcin kowalczyk's comment, window size small show title. curiously, without widgets window expanded show title, hence assumption wasn't there.