code: func (v *RecentManager) AddItem(fileURI string) bool {
  	cstr := C.CString(fileURI)
  	defer C.free(unsafe.Pointer(cstr))
  	cok := C.gtk_recent_manager_add_item(v.native(), (*C.gchar)(cstr))
  	return gobool(cok)
  }
docs: // AddItem is a wrapper around gtk_recent_manager_add_item().