How to use INotifyCollectionChanged interface?

I am doing the following:

public class myClass : INotifyCollectionChanged
{
    public ObservableCollection<myModel> myCollection { private set; get; }

    public myClass()
    {
        this.myCollection = new ObservableCollection<myModel> ();
    }

    public event NotifyCollectionChangedEventHandler CollectionChanged;
}

But in XS it says CollectionChanged is never used. What am I doing wrong? Any code need to be added. As such, is it needed to implement the interface? If so, how?