[Q] Any simple usage of Collection undo/redo?

[tangible-idea]

I'm trying to create a system to redo/undo with the whole canvas elements of my program with muf.
canvas elements is bound to ObservableCollection<FrameworkElement> and everytime user add/remove the element, it goes to the property

public CustomCollection<FrameworkElement> m_CanvasElements = new CustomCollection<FrameworkElement>();
    public CustomCollection<FrameworkElement> CanvasElements
    {
        get {
            return m_CanvasElements; }
        set {

            m_CanvasElements = value;
            OnPropertyChanged("CanvasElements");
        }
    }

And here's what I've tried to do. I made an inherited class of ObservableCollection to use an NotifyCollectionChangedEventArgs as a parameter.

public class CustomCollection<T> : ObservableCollection<T>, ICloneable
    {
        public event EventHandler<NotifyCollectionChangedEventArgs> ItemAdded;

        public CustomCollection()
        {
            CollectionChanged += MyObservableCollection_CollectionChanged;
        }

        void MyObservableCollection_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {

            DefaultChangeFactory.Current.OnCollectionChanged(this, "CanvasElements", MainWindow.VM.m_CanvasElements, e);
         ...
        }

I have tried both OnCollectionChanged and GetCollectionChange. and it seems doesn't work.
Currently, OnChanging is working exactly that I expected.
Any ideas?

[tangible-idea]

My mistake
I had to change
DefaultChangeFactory.Current.OnCollectionChanged(this, "CanvasElements", MainWindow.VM.m_CanvasElements, e);
to
DefaultChangeFactory.Current.OnCollectionChanged(MainWindow.VM, "CanvasElements", MainWindow.VM.m_CanvasElements, e);