[pygtk] Widgets not respect can focus = False

[Maximiliano Robaina]

Hi,

I need avoid what, some widgets (buttons), don't take focus when tab key 
is pressed.
I set Can Focus and Has Focus to False, but this don't work.

I'am using python 2.5, GTK 2.10.11, pyGTK 2.0 and glade 2.12.1

Thanks in advance.