An error occurred while saving the commentUlrich Krömer commented
there are several ways to do that already:
first locators do allow indices so you can see you want group.find("/Button) which will return the fifth Button under the group. That is essentially what the index attribute provided in the Classic Agent. Furthermore you can also use the windowid attribute which will very likely be set if you internationalize an application as in that case you have to identify it also with an id. that will then provide a more stable approach anyway.