code: func (v *Menu) Append(label, detailed_action string) {
  	cstr1 := (*C.gchar)(C.CString(label))
  	defer C.free(unsafe.Pointer(cstr1))
  
  	cstr2 := (*C.gchar)(C.CString(detailed_action))
  	defer C.free(unsafe.Pointer(cstr2))
  
  	C.g_menu_append(v.native(), cstr1, cstr2)
  }
docs: // Append is a wrapper around g_menu_append().