Rank with selection

[#1]

Hi All!

I have the following expression

=Aggr( if(Rank(Sum({<Año = {'2012'},Semana_GL = {'$(=$(vMaxSemana)-1)'}, AgpPautaNombre=>}SoutMontoDespTotal)) = 3, AgpPautaNombre), AgpPautaNombre)

The idea is that for a specific week in the year, I want to know which AgPautaNombre was in the 3rd place.

This works ok when I dont have a selection of AgPautaNombre.

The thing is that what I really want to do is when I select an AgPautaNombre, I want to know which AgPautaNombre was in the selected AgPautaNombre rank last week, but when I make the selection my textbox goes null.

I'm kind of blocked, any Ideas?

[#2]

Any ideas?