easy navigation between lists in a group?



I have a question. I have a group (not a grouplist) with multiple lists. I want to move from one to the next. I know I need to specify the id of the list. e.g.:

xml:
<ondown>2</ondown> 

Is there also a way to use the position of the list instead of the id? Like:

xml:
<ondown>Container.Position(1)</ondown>

I also tried the most obvious:

xml:
<ondown>Down</ondown>

but that’s also not working.

I tried to use arithmetics but I think that’s not supported. Like 

xml:
<ondown>$PARAM[id]+1</ondown>

I appreciate any help.

Thanks guys!