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I found on this link ObservableCollection not noticing when Item in it changes (even with INotifyPropertyChanged) some techniques to notify a Observablecollection that an item has changed. the TrulyObservableCollection in this link seems to be what i'm looking for. public class TrulyObservableCollection<T> : ObservableCollection<T> where T : INotifyPropertyChanged { public TrulyObservableCollection() : base() { CollectionChanged += new NotifyCollectionChangedEventHandler(TrulyObservableCollection_CollectionChanged); } void TrulyObservableCollection_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { if (e.NewItems != null) { foreach (Object item in e.NewItems) { (item as INotifyPropertyChanged).PropertyChanged += new PropertyChangedEventHandler(item_PropertyChanged); } } if (e.OldItems != null) { foreach (Object item in e.OldItems) { (item as INotifyPropertyChanged).PropertyChanged -= new PropertyChangedEventHandler(item_PropertyChanged); } } } void item_PropertyChanged(object sender, PropertyChangedEventArgs e) { NotifyCollectionChangedEventArgs a = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset); OnCollectionChanged(a); } } But when I try to use it, I don't get notifications on the collection. I'm not sure how to correctly implement this in my C# Code: XAML : <DataGrid AutoGenerateColumns="False" ItemsSource="{Binding MyItemsSource, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"> <DataGrid.Columns> <DataGridCheckBoxColumn Binding="{Binding My

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