[pygtk] Can't set a parent on widget which has a parent

[Alexander Kuleshov]

Hello. I have following problem. Am writing a simple program with
pygtk. I have a window on it located menu, statusbar and NoteBook. The
tabs should be located NoteBook element GtkTextView. By clicking on
the menu, I must appear a new tab with GtkTextView. But I get the
following: Can't set a parent on widget which has a parent

What to do in this case?

Code: http://pastie.org/816150

Thanks