Android Toolbar Above PageLayout

Hi.
I am using the new Material Design Toolbar on my Xamarin Forms App (see: https://blog.xamarin.com/material-design-for-your-xamarin-forms-android-apps/), but i want to make it overlay my NavigationPages.

I tried using

<item name="android:windowActionBarOverlay">true</item>
<item name="windowActionBarOverlay">true</item>