Binding-Error when binding to an Usercontrol

Question

I created a own view called StdListView, which contains a Usercontrol called AutoGeneratedFilterBar. I want to "pass" a List to the AutoGeneratedFilterBar-Control via Data-Binding. But this didn't work. Binding error:

System.Windows.Data Error: 40 : BindingExpression path error: 'Items' property not found on 'object' ''AutoGeneratedFilterBar' (Name='')'. BindingExpression:Path=Items; DataItem='AutoGeneratedFilterBar' (Name=''); target element is 'AutoGeneratedFilterBar' (Name=''); target property is 'ItemsSource' (type 'ObservableCollection`1')

I understand the error to mean that the user control is looking for a property called Items in its own data-context.

Here is my Code: The XAML-Code of the View, which contains the Usercontrol:

<Window x:Class="MarketingTool.UI.StandardGUIViews.View.StdListView"
    ...
    xmlns:ctrl="clr-namespace:MarketingTool.UI.Controls"
    mc:Ignorable="d"
    Title="StandardListView" Height="450" Width="800">

<Grid>

    <Grid.RowDefinitions>
        <RowDefinition Height="50"></RowDefinition>
    </Grid.RowDefinitions>

    <ctrl:AutoGeneratedFilterBar Grid.Row="0" ItemsSource="{Binding Items}"></ctrl:AutoGeneratedFilterBar>
  
</Grid>

Code-behind of this view:

public partial class StdListView : Window
{
    public StdListView()
    {
        InitializeComponent();
    }
}

ViewModel of this view:

public class UserListViewModel : DependencyObject, INotifyPropertyChanged{

public ObservableCollection<User> Items
{
    get
    {
        return _items;
    }
    set
    {
        if (value != _items)
        {
            _items = value;
            OnPropertyChanged("Items");
        }
    }
}

public UserListViewModel(Window currentWindow) : base(currentWindow)
{
    LoadItems();
}

protected  void LoadItems()
{
    UserRepository userRepository = new UserRepository();
    Items = new ObservableCollection<User>(userRepository.List());

}

private Window currentWindow;

public event PropertyChangedEventHandler PropertyChanged;

protected void OnPropertyChanged([CallerMemberName] string name = null)
{
    PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
}
}

Call of the Window with the usercontrol:

  StdListView stdListView = new StdListView();
  UserListViewModel userListViewModel = new UserListViewModel(stdListView);
  stdListView.DataContext = userListViewModel;
  stdListView.Show();

And here comes the usercontrol-xaml (There is currently nothing in the xaml, as I only need the item source data later in the code.):

<UserControl x:Class="MarketingTool.UI.Controls.AutoGeneratedFilterBar"
         ...
         xmlns:local="clr-namespace:MarketingTool.UI.Controls"
         d:DesignHeight="450" d:DesignWidth="800">

</UserControl.Resources>
<Grid x:Name="FilterbarLayoutRoot" >
    <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Hidden" >
        ...
    </ScrollViewer>
</Grid>
</UserControl>

UserControl code-behind:

public partial class AutoGeneratedFilterBar : UserControl
{
    public ObservableCollection<User> ItemsSource
    {
        get { return (ObservableCollection<User>)GetValue(ItemsSourceProperty); }
        set { SetValue(ItemsSourceProperty, value); }
    }
  
    public static readonly DependencyProperty ItemsSourceProperty =
        DependencyProperty.Register("ItemsSource", typeof(ObservableCollection<User>), typeof(AutoGeneratedFilterBar), new PropertyMetadata(default(ObservableCollection<User>)));


    public AutoGeneratedFilterBar()
    {
        DataContext = this;
        InitializeComponent();

        var ItemsSourcePropertyDescriptor = DependencyPropertyDescriptor.FromProperty(AutoGeneratedFilterBar.ItemsSourceProperty, typeof(AutoGeneratedFilterBar));
        tp.AddValueChanged(this, ItemsSourcePropertyChanged);
    }

    private void ItemsSourcePropertyChanged(object sender, EventArgs e)
    {
        int i = 0;
    }
}