The user function window (Wiz_window) must be closed before the user function page (Uf_page), so
that the Wiz_window._handler_close() can still operate the methods of the Uf_page. This avoids a
huge quantity of these errors:
Traceback (most recent call last):
File "/data/relax/relax-trunk/gui/wizards/wiz_objects.py", line 723, in _handler_close
self._pages[self._current_page].on_next()
File "/usr/lib64/python2.7/site-packages/wx-2.8-gtk2-unicode/wx/_core.py", line 14615, in
__getattr__
raise PyDeadObjectError(self.attrStr % self._name)
wx._core.PyDeadObjectError: The C++ part of the Uf_page object has been deleted, attribute access no
longer allowed.
