Tab bar color using android:TabbedPage.BarItemColor

The following is my code on my Main Page Tabbed Page placed at the top. When I preview in android emulator however, the tab bar text shows up as white. When I click it does change to blue though. Any ideas why this would be happening?

Thanks!

        android:TabbedPage.ToolbarPlacement="Bottom"
        android:TabbedPage.BarItemColor="Black"
        android:TabbedPage.BarSelectedItemColor="Blue"