如何将自定义控件的ObservableCollection绑定到StackPanel？

public ObservableCollection<string> Items
{
    get { return (ObservableCollection<string>)GetValue(ItemsProperty); }
    set { SetValue(ItemsProperty, value); }
}

public static readonly DependencyProperty ItemsProperty =
    DependencyProperty.Register("Items", typeof(ObservableCollection<string>), typeof(CustomControl), new PropertyMetadata(null));

<ItemsControl ItemsSource="{Binding Items, RelativeSource={RelativeSource TemplatedParent}}">
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <!-- 在这里定义每个数据项的展示方式 -->
            <TextBlock Text="{Binding}" />
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

<local:CustomControl Items="{Binding MyItems}" />

public ObservableCollection<string> MyItems { get; set; }

MyItems = new ObservableCollection<string>();
MyItems.Add("Item 1");
MyItems.Add("Item 2");