ContentControl doesnt show data

Hello

I defined UserControl in UWP XAML, but It doesnt show any data:

<UserControl
    x:Class="Financial_Planner.BSListView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Financial_Planner"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300"
    d:DesignWidth="400">
    <UserControl.Resources>
        <DataTemplate x:Key="AAA">
            <TextBox Text="AAAAAAAAAAAAAAAAAAAAAAa"></TextBox>
        </DataTemplate>
        
    </UserControl.Resources>

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition x:Name="HeaderArea" Height="Auto"></RowDefinition>
            <RowDefinition x:Name="UpperSummariesArea" Height="Auto"></RowDefinition>
            <RowDefinition x:Name="ListViewArea" Height="*"></RowDefinition>
            <RowDefinition x:Name="DownSummariesArea" Height="Auto"></RowDefinition>

            <RowDefinition x:Name="TestRow" Height="Auto"></RowDefinition>
        </Grid.RowDefinitions>

        <ContentControl MinHeight="300" MinWidth="300"
            x:Name="ccHeaderArea" Grid.Row="0"                                          
            HorizontalContentAlignment="Stretch"                             
            VerticalContentAlignment="Stretch"
            Content="{x:Bind HeaderDataSource, Mode=OneWay}"                            
            ContentTemplate="{x:Bind HeadersTemplate, Mode=OneWay}"
                >
        </ContentControl>
    </Grid>

code behind

    public sealed partial class BSListView : UserControl
    {
        public DataTemplate HeadersTemplate { get; set; }
        public DataTemplate UpperSummariesTemplate { get; set; }
        public DataTemplate ItemsTemplate { get; set; }
        public DataTemplate DownSummariesTemplate { get; set; }
        public object HeaderDataSource { get; set; }
        public object UpperSummariesDataSource { get; set; }
        public IEnumerable ListViewItemsSource { get; set; }
        public object DownSummariesDataSource { get; set; }
        public BSListView()
        {
            this.InitializeComponent();
            lv.ItemsSource = this.ListViewItemsSource;
        }
        public void Init<T>(ObservableCollection<T> source)
        {
            this.HeadersTemplate = this.Resources["AAA"] as DataTemplate;
        }
    }
}

Next I declare my user control in my app xaml and code behind i use command myDeclaredUserControl.Init(). There should be showed HeadersTemplate with AAAAAAA text, but is not, why? The same problem is If I want to pass HeadersTemplate from my app to UserControll. How to fix my problem.