Czemu nie widac app bar w aplikacji

Witam probuje napisac prosty notatnik ale poki co nie wiem dlaczego nie jest widoczna kontrolka bottomAppBar.
Czy moglby ktos zerknac ?

<common:LayoutAwarePage
    x:Name="pageRoot"
    x:Class="ProstyEdytorTekstu_str572.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:ProstyEdytorTekstu_str572"
    xmlns:common="using:ProstyEdytorTekstu_str572.Common"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" Height="658">

    <Page.Resources>

        <!-- TODO: Delete this line if the key AppName is declared in App.xaml -->
        <x:String x:Key="AppName">My Application</x:String>
    </Page.Resources>
    <common:LayoutAwarePage.BottomAppBar>
        <AppBar x:Name="bottomAppBar" Padding="10,0,10,0" IsHitTestVisible="False">
            <AppBar.Background>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="Black"/>
                    <GradientStop Color="#FF2C2C0D" Offset="1"/>
                </LinearGradientBrush>
            </AppBar.Background>
            <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
                <Button x:Name="openButton" Click="openButton_Click"
                    Style="{StaticResource OpenFileAppBarButtonStyle}" IsEnabled="False"/>
                    <Button x:Name="saveButton" IsEnabled="false"
                        Click="saveButton_Click"
                        Style="{StaticResource SaveAppBarButtonStyle}"/>
                
            </StackPanel>
        </AppBar>
    </common:LayoutAwarePage.BottomAppBar>

    <!--
        This grid acts as a root panel for the page that defines two rows:
        * Row 0 contains the back button and page title
        * Row 1 contains the rest of the page layout
    -->
    <Grid Style="{StaticResource LayoutRootStyle}" Height="672" VerticalAlignment="Top">
        <Grid.RowDefinitions>
            <RowDefinition Height="140"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <!-- Back button and page title -->
        <Grid>
            
            <Grid Grid.Row="1" Margin="120,0,60,60">
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition/>
                    <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>
                <TextBlock x:Name="filename" Margin="20" FontSize="40" HorizontalAlignment="Center" Style="{StaticResource TitleTextStyle}">
                    Prosty edytor tekstu
                </TextBlock>
                <Border Margin="10" Grid.Row="1">
                    <TextBox x:Name="text" AcceptsReturn="True"
                		ScrollViewer.VerticalScrollBarVisibility="Visible"
                		ScrollViewer.HorizontalScrollBarVisibility="Visible"
                		TextChanged="text_TextChanged" Margin="-32,0,0,-434"/>
                </Border>
            </Grid>
        </Grid>

        <VisualStateManager.VisualStateGroups>

            <!-- Visual states reflect the application's view state -->
            <VisualStateGroup x:Name="ApplicationViewStates">
                <VisualState x:Name="FullScreenLandscape"/>
                <VisualState x:Name="Filled"/>

                <!-- The entire page respects the narrower 100-pixel margin convention for portrait -->
                <VisualState x:Name="FullScreenPortrait">
                    <Storyboard>
                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="backButton" Storyboard.TargetProperty="Style">
                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PortraitBackButtonStyle}"/>
                        </ObjectAnimationUsingKeyFrames>
                    </Storyboard>
                </VisualState>

                <!-- The back button and title have different styles when snapped -->
                <VisualState x:Name="Snapped">
                    <Storyboard>
                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="backButton" Storyboard.TargetProperty="Style">
                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource SnappedBackButtonStyle}"/>
                        </ObjectAnimationUsingKeyFrames>
                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="pageTitle" Storyboard.TargetProperty="Style">
                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource SnappedPageHeaderTextStyle}"/>
                        </ObjectAnimationUsingKeyFrames>
                    </Storyboard>
                </VisualState>
            </VisualStateGroup>
        </VisualStateManager.VisualStateGroups>
    </Grid>
</common:LayoutAwarePage>