有没有办法在WPF面板中添加/删除子项时收到通知？

public class MyViewModel
{
    public ObservableCollection<MyItem> Items { get; set; }

    public MyViewModel()
    {
        Items = new ObservableCollection<MyItem>();
    }

    public void AddItem(MyItem item)
    {
        Items.Add(item);
    }

    public void RemoveItem(MyItem item)
    {
        Items.Remove(item);
    }
}

public class MyViewModel
{
    public ObservableCollection<MyItem> Items { get; set; }

    public MyViewModel()
    {
        Items = new ObservableCollection<MyItem>();
        Items.CollectionChanged += Items_CollectionChanged;
    }

    private void Items_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {
        // 在这里处理添加或删除子项的通知
    }

    public void AddItem(MyItem item)
    {
        Items.Add(item);
    }

    public void RemoveItem(MyItem item)
    {
        Items.Remove(item);
    }
}

public class MyItem : INotifyPropertyChanged
{
    // 实现INotifyPropertyChanged接口的代码

    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

public class MyViewModel
{
    public ObservableCollection<MyItem> Items { get; set; }

    public MyViewModel()
    {
        Items = new ObservableCollection<MyItem>();
    }

    public void AddItem(MyItem item)
    {
        item.PropertyChanged += Item_PropertyChanged;
        Items.Add(item);
    }

    public void RemoveItem(MyItem item)
    {
        item.PropertyChanged -= Item_PropertyChanged;
        Items.Remove(item);
    }

    private void Item_PropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        // 在这里处理子项属性更改的通知
    }
}