MainWindow.xaml

<?xml version="1.0" encoding="utf-8"?>
<Window
    x:Class="NavigationViewKeyboardAcceleratorsTest.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:NavigationViewKeyboardAcceleratorsTest"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <NavigationView ItemInvoked="NavigationView_ItemInvoked">

        <NavigationView.MenuItems>

            <NavigationViewItem Content="Item 1"
                                x:Name="Item1"/>

            <NavigationViewItem Content="Item 2"
                                x:Name="Item2"/>

            <NavigationViewItem SelectsOnInvoked="False" Content="Keyboard accelarator button">

                <NavigationViewItem.KeyboardAccelerators>

                    <KeyboardAccelerator Key="N"
                                         Modifiers="Control"/>

                </NavigationViewItem.KeyboardAccelerators>

            </NavigationViewItem>

        </NavigationView.MenuItems>

        <StackPanel>

            <TextBlock Text="How many times have ItemInvoked been called"/>

            <TextBlock x:Name="ItemInvokedCount"/>
            
        </StackPanel>
        
    </NavigationView>
    
</Window>