code: func (v *ComboBox) SetActiveID(id string) bool {
  	cid := C.CString(id)
  	defer C.free(unsafe.Pointer(cid))
  	c := C.gtk_combo_box_set_active_id(v.native(), (*C.gchar)(cid))
  	return gobool(c)
  }
docs: // SetActiveID is a wrapper around gtk_combo_box_set_active_id().