如何让多个ItemsControl知道彼此的z索引？WPF

public static class ItemHelper
{
    public static readonly DependencyProperty ZIndexProperty =
        DependencyProperty.RegisterAttached("ZIndex", typeof(int), typeof(ItemHelper));

    public static int GetZIndex(DependencyObject obj)
    {
        return (int)obj.GetValue(ZIndexProperty);
    }

    public static void SetZIndex(DependencyObject obj, int value)
    {
        obj.SetValue(ZIndexProperty, value);
    }
}

private void UpdateZIndexes(ItemsControl itemsControl)
{
    for (int i = 0; i < itemsControl.Items.Count; i++)
    {
        var container = itemsControl.ItemContainerGenerator.ContainerFromIndex(i) as FrameworkElement;
        if (container != null)
        {
            ItemHelper.SetZIndex(container, i);
        }
    }
}

public class ItemViewModel : INotifyPropertyChanged
{
    private int zIndex;
    public int ZIndex
    {
        get { return zIndex; }
        set
        {
            if (zIndex != value)
            {
                zIndex = value;
                OnPropertyChanged(nameof(ZIndex));
            }
        }
    }

    // Other properties and methods...
}

<ListBox x:Name="myListBox" ItemContainerStyle="{StaticResource ItemStyle}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Name}" local:ItemHelper.ZIndex="{Binding ZIndex}" />
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

private void ListBox_Drop(object sender, DragEventArgs e)
{
    // Perform the drop operation...
    UpdateZIndexes(myListBox);
}