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Unhandled Exception: System.InvalidCastException: Specified cast is not valid.
   at GLib.ObjectManager.CreateObject(IntPtr raw)
   at GLib.Object.GetObject(IntPtr o, Boolean owned_ref)
   at GLib.Object.GetObject(IntPtr o)
   at Glade.XML.GetWidget(String name)
   at Glade.XML.BindFields(Object target, Type type)
   at Glade.XML.Autoconnect(Object handler)
   at Boogie..ctor(String[] args)
   at Boogie.Main(String[] args)