Forbid focusing of TreeView columns

Hi all,

I'm building a PyGTK interface in which I would like that no widget
would be able to get the focus (and so to be activated by pressing the
Return key). For this purpose, for each widget, I do:

    widget.set_property("can-focus", gtk.FALSE)

My problem is a TreeView which has a clickable column, it get the
default focus and I did not find how to forbid that.

I tried:

    def focus (widget, *args) :
        try :
            widget.set_property("can-focus", gtk.FALSE)
        except :
            pass
        try :
            widget.set_property("can-default", gtk.FALSE)
        except :
            pass
    win.forall(focus)

where win is my application window (I also tried on the TreeView) but
it doesn't work.  :-(
I also tried with widget.unset_flags, same result.  :-((

If I choose another widget and give it the default focus
(widget.grab_default and widget.grab_focus) it's OK until I click on
the column which then keeps the focus.  :-(((

I'm sure I could capture the Return key but I don't want to have this
dashed line around the focused widget...

I think that this column has somewhere an associated widget but I
could not find it anywhere (and neither could win.forall).

I'm using PyGTK-2.0.0 and cannot use another version.

Thanks in advance for any idea!
Franck
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