[pygtk] How can I modify widgets from a forked process?

[Link Master]

How can I modify widgets from a forked process (through os.fork)? This is
what I currently which does not work:

self.pid = os.fork()
if self.pid == 0:
    self.start.set_label("Start")
    self.hours.set_sensitive(True)
    self.minutes.set_sensitive(True)
    self.seconds.set_sensitive(True)
    self.message.set_sensitive(True)
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