unicode in menus

As I try to write menu items with unicode chars in it (like "relatório", for instance), program fails like:
Traceback (most recent call last):
File "/home/ivan/python/wxglade/application.py", line 445, in generate_code
CodeWriter(common.code_writers[cw], out.getvalue(), True,
File "/usr/lib/python2.6/StringIO.py", line 270, in getvalue
self.buf += ''.join(self.buflist)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 42: ordinal not in range(128)

I will sign later. For now, my email is ivan.nazarenko@gmail.com

Regards.