aClass->get_role = getRoleCB;
classInitCB(AtkObjectClass *aClass){    //    GObjectClass *gobject_class = G_OBJECT_CLASS(aClass);    parent_class = g_type_class_peek_parent(aClass);    aClass->ref_state_set = refStateSetCB;    aClass->get_role = getRoleCB;    // aClass->initialize = initializeCB;    // gobject_class->finalize = finalizeCB;}