<configure
    xmlns="http://namespaces.zope.org/zope"
    xmlns:zcml="http://namespaces.zope.org/zcml">

    <subscriber
        for="sauna.reload.events.INewChildIsReady"
        handler=".theming.onStartup"
        zcml:condition="installed plone.app.theming"
        />

</configure>
