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copied!<p>This may be a little long, here would be my best guess:</p> <pre><code>public class CustomClass : INotifyPropertyChanged { public CustomClass() { sub1item = new ObservableDictionary<string, InnerClass>(); // This next line may not be necessary... Changes might propogate up. sub1item.CollectionChanged += () => NotifyPropertyChange("Sub1Item"); } private ObservableDictionary<string, InnerClass> sub1item; public ObservableDictionary<string, InnerClass> Sub1Item { get { return sub1item; } private set { sub1item = value; NotifyPropertyChange("Sub1Item"); } } public event PropertyChangedEventHandler PropertyChanged; private void NotifyPropertyChanged(String info) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(info)); } } } public class InnerClass : INotifyPropertyChanged { public SomeEnum Status { get { return this.status; } private set { this.status = value; NotifyPropertyChange("Status"); } } public event PropertyChangedEventHandler PropertyChanged; private void NotifyPropertyChanged(String info) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(info)); } } } </code></pre> <p>Just make sure you update your status by calling Status = something, and not directly through this.status</p> <p><strong>Edit:</strong> If you're just looking to ONLY update the single object that got the updated status, I'm not sure that this will do it. I suspect this will signal that Sub1Item changed, but mainitems will likely not know about the individual object. It depends on your implementation.</p> <p>If you created a DataTemplate for CustomClass, which had a binding to Sub1Item, then your binding will properly update for only the updated status</p> <pre><code><DataTemplate DataType="{x:Type myClrNamespace:InnerClass}"> <Grid> <TextBlock Text={Binding Path=Status}/> </Grid> </DataTemplate> ... <ListBox x:Name="listStatus"/> </code></pre> <p>Then in the C# somewhere, you could have: <code>listStatus = mainlist[0].Sub1Item;</code> After seeing your example of your TreeView ItemTemplate though, I'm not sure anymore.</p>

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