why doesn't currentLevel keep incrementing at the example

Question

Hello all,

I have a question about the next example

http://www.iphonesdkarticles.com/2009/03/drill-down-table-view-with-detail-view.html

Now I wonder why doesn't the rvController.CurrentLevel keep incrementing? I've build something simular and would be delighted if CurrentLevel kept incrementing. But i placed a breakpoint there and saw that it didn't do that.

Does anyone know why and what the solution is to increment it ( so if you have 4 screens it would increment 4 times and show a 4 integer when i place a breakpoint and debug)?