NavigatePrism.xaml

<?xml version="1.0" encoding="UTF-8"?>
<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms" 
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
             x:Class="PrismUnitySample.Views.CustomTabbedPage"
             xmlns:local="clr-namespace:PrismUnitySample.Views"
             Title="My App">
	<TabbedPage.Children>   
        <NavigationPage Title="Tab 1">
            <x:Arguments>
                 <local:Test1Page />
            </x:Arguments>
        </NavigationPage>

         <NavigationPage Title="Tab 1">
            <local:Test2Page />
        </NavigationPage>
    </TabbedPage.Children>
</TabbedPage>