Wilie Walker writing this answer my question with this problem:
Hi Attila:
I believe that patch is not what the GTK+ folks intended to be the
solution. Instead, the third (the last) patch is the one to use, and is
the one that
has been committed.
If it's not working, either a11y integration is
Public bug reported:
Dear Ubuntu Developers!
When I trying shutdown the sistem with system/shutdown menu item, the dialog
are inaccessible with Orca screen reader. This problem present with logout
dialog and shutdown dialog.
In Hardy, this dialogs are work fine.
Same users says this bug with
