Customize child lookup such that all installed offerings on the site
        store that this page is viewing are given an opportunity to display
        their own page.

def _getAppStoreResource(self, ctx, name):
        """
        Customize child lookup such that all installed offerings on the site
        store that this page is viewing are given an opportunity to display
        their own page.
        """
        offer = self.frontPageItem.store.findFirst(
            offering.InstalledOffering,
            offering.InstalledOffering.offeringName == unicode(name, 'ascii'))
        if offer is not None:
            pp = ixmantissa.IPublicPage(offer.application, None)
            if pp is not None:
                warn("Use the sharing system to provide public pages,"
                     " not IPublicPage",
                     category=DeprecationWarning,
                     stacklevel=2)
                return pp.getResource()
            return SharingIndex(offer.application.open(),
                                self.webViewer)
        return None