Glade + Python = No GUI

[Kveldulv]

I made simple GUI in Glade 3 (Ubuntu 7.04) consisting of only 2
buttons. When I run
2buttonsgui.py, no GUI pops out

#!/usr/bin/env python
import pygtk
import gtk.glade

class TwoButtonsGUI:
    def __init__(self):
        self.window = gtk.glade.XML("/home/myusername/Desktop/
2buttons.glade", "window1")

if __name__ == '__main__':
    TwoButtonsGUI()
    gtk.main()

When interrupted, I get

File "gui.py", line 11, in <module>
    gtk.main()

When GUI coded manually, all works.

Thanks in advance

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