custom page and 2 sections problem

Hi all,
I have 2 sections, one for new installation and one for upgrade .In one I want to use curtain custom page and the upgrade I don't want to see that page. However when I put

Page custom CustomPage

in the page definitions this custom page always apears.
How can I solve this issue?

Thanks

Call Abort in the page's function if you don't want to show it.