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C # Linking to an ObservableCollection in another ObservableCollection

I have an ObserveableCollection that contains another ObserveableCollection. In my WPF, I set the binding to Person.Lectures. My problem now, when I change any value in the collection of "lectures", the collection "people" does not notify about it, and I am not attached to any. Is this generally a problem when using an ObserveableCollection in another ObserveableCollection?

How can I solve this problem so that my binding will respond?

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ObservableCollection INotifyCollectionChanged, (, ..) .

, , , ObservableCollection, INotifyPropertyChanged. , , , , .

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, ObservableCollection of Person, ObservableCollection of Lectures. ? , , .

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( WPF ) ObservableCollection, BindingList "" .

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