No iAd appear on my app in AppStore.

Hello friends.

I have a little question. Apple has approved my application (Multas Chile) . I have put an AdView in all screens. I also have already get the iAd contract using Itunes Connect ('iAd App Network' appears in 'Contracts in effects' list). And yet, people who download my App, cannot see iAds.

In Titanium simulator everything is good, there I can find the box which say: "You're Connected to iAd". But when I download it from AppStore, there no iAd appears

My question is: Should I do any thing else? Have I forgot a step? Should I activate AdView in my code?

Thank you very much in advance. :)

<Alloy> 
    <Tab id="tab_mySearches" onFocus="tab_mySearches_onFocus">      
        <Window id="win_mySearches">
 
            <TableView id="tv_mySearches" onClick="tv_mySearches_onClick"> 
            </TableView>            
 
            <AdView id="mainAd"></AdView>
 
        </Window>
    </Tab>      
</Alloy>