[pygtk] signal for detecting a losing focus in an entry

[Joe Nall]

I'm successfully catching a <return> in an entry field and updating another computed field. I would like to catch and edit then a tab out as well. Is there a signal for this? What I have now is :
 self.foo  = gtk.Entry(15)
 self.foo.connect('activate', self.update)


thanks,
joe