Python and glade program - without errors but didn't display anything

[Raji Seetharaman]

Hi all,
i tried to develop a calculator using glade and python.
When i run the script(python calculatorglade.py), i didn't get any errors.
A calculator gui is supposed  to be displayed. But no window appears.
With Ctrl + C, i killed it. I got the following response from the terminal

^CTraceback (most recent call last):
  File "calculatorglade.py", line 106, in <module>
    gtk.main()
KeyboardInterrupt

The Python program is available here, http://pastebin.com/m44d2c1cb

The corresponding Glade xml file is available here,
http://pastebin.com/m46beaac5

What should i do to display the gui window?

Regards
Raji. S
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