How to add page to the end of another page for Xamarin.Forms

Question

I want to create a analog of shell's tabbar (shell doesn't appropriate for me) with 2 buttons at the end of every page. I created

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="IndDict.NavigationButtons">
    <ContentPage.Content>
        <StackLayout VerticalOptions="End">
            <Button Text="Dictionary" Pressed="DictOpen"/>
            <Button Text="Tools" Pressed="ToolsOpen"/>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

Any ideas how to add this to the page:

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="IndDict.Page3">
    <ContentPage.Content>
        <StackLayout>
            <Label Text="Welcome to Xamarin.Forms!"
                VerticalOptions="CenterAndExpand" 
                HorizontalOptions="CenterAndExpand" />
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

? Thanks for responding!