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copied!<p>You can just have the parent VM connect to the PropertyChanged event on the child VMs. It's kind of a PITA to keep track of the children who have been added/removed etcetera so you might instead consider storing your child VMs in my <code>ItemObservableCollection</code>:</p> <pre><code>public sealed class ItemObservableCollection<T> : ObservableCollection<T> where T : INotifyPropertyChanged { public event EventHandler<ItemPropertyChangedEventArgs<T>> ItemPropertyChanged; protected override void InsertItem(int index, T item) { base.InsertItem(index, item); item.PropertyChanged += item_PropertyChanged; } protected override void RemoveItem(int index) { var item= this[index]; base.RemoveItem(index); item.PropertyChanged -= item_PropertyChanged; } protected override void ClearItems() { foreach (var item in this) { item.PropertyChanged -= item_PropertyChanged; } base.ClearItems(); } protected override void SetItem(int index, T item) { var oldItem = this[index]; oldItem.PropertyChanged -= item_PropertyChanged; base.SetItem(index, item); item.PropertyChanged -= item_PropertyChanged; } private void item_PropertyChanged(object sender, PropertyChangedEventArgs e) { OnItemPropertyChanged((T)sender, e.PropertyName); } private void OnItemPropertyChanged(T item, string propertyName) { ItemPropertyChanged.Raise(this, new ItemPropertyChangedEventArgs<T>(item, propertyName)); } } </code></pre> <p>Then your parent VM can just listen for all changes to child items with:</p> <pre><code>_formFields.ItemPropertyChanged += (s, e) => Foo(); </code></pre>

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