Forms :: Dynamic Access To Radio Buttons?

For passing my apprenticeship I am developing part of an application to change the language of the application dynamically.

My first idea looks like this:

In each form I add a package that works like this:

block := first block
loop
..item := first item
..loop
....set item label or prompt to new language
....exit when item = last item
....item := next item
..end loop

..exit when block = last block
..block := next block
end loop

That far everything is fine. With the get_form_property I can access the first and last block and always get the next block with the get_block_property. Same is true for the items by get_block_property for the first and last item and the get_item_property for the next item. By this way I can dynamically chance all item prompts and labels without knowing the name or the number of blocks and items. But what about radio groups? Is there any possibility (and if yes, which?) to get the first, last and next radio button of a radio group in the same way?