Program crash when:
1. Use EPaned in the program and
2. with GNOME_ACCESSIBILITY != 1 and
3. the program invokes "gtk_widget_get_accessible"

e.g.
...
        hpaned = e_hpaned_new ();
        atko = gtk_widget_get_accessible (GTK_WIDGET(hpaned));
...

it says:
(shortcut-bar-demo:24941): GLib-GObject-WARNING **: invalid cast from
`GalA11yEPaned' to `GtkAccessible' 
(shortcut-bar-demo:24941): GLib-GObject-WARNING **: gtype.c:2967: type id
`0' is invalid
 
(shortcut-bar-demo:24941): GLib-GObject-WARNING **: can't peek value table
for type `<invalid>' which is not currently referenced

---------------------------------------------------------------------------
possible reason:
When use "Run-time inheritance" in GalA11yEPaned, one can not suppose which
  type the GalA11yEPaned is inheriting form. Actually, when
GNOME_ACCESSIBILITY != 1 it inherits from AtkNoOpObject; when
GNOME_ACCESSIBILITY = 1 it inherits form GailContainer.
So we should be careful when casting a pointer of GalA11yEPaned to any
other type. Check the type before casting maybe necessary.