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    <p>After our conversation above, this is rather moot, but I thought about how I'd implement a base class that fired PropertyChanged events when a collection changed in a property that was defined by the subclass. As I said, it's a bit non-standard, but here's how I'd do it.</p> <pre><code>class FancyCollectionAndPropertyChangedBase : INotifyPropertyChanged { private Dictionary&lt;ICollectionChanged, String&gt; collectionNameLookup = new Dictionary&lt;ICollectionChanged, String&gt;(); protected FancyCollectionAndPropertyChangedBase() { this.PropertyChanged += MyPropertyChanged; } private void MyPropertyChanged(object sender, PropertyChangedEventArgs e) { if(this.collectionNameLookup.ContainsValue(e.PropertyName) { KeyValuePair&lt;INotifyCollectionChanged, String&gt; oldValue = this.collectionNameLookup.First(kvp =&gt; kvp.Value == e.Name); oldValue.Key -= MyCollectionChanged; this.collecitonNameLookup.Remove(oldValue.Key); INotifyCollectionChanged collection = this.GetType().GetProperty(e.PropertyName, BindingFlags.FlattenHierarchy).GetValue(this, null); collection.CollectionChanged += MyCollectionChanged; this.collectionNameLookup.Add(collection, e.Name); } else if(typeof(INotifyCollectionChanged).IsAssignableFrom(this.GetType().GetProperty(e.PropertyName, BindingFlags.FlattenHierarchy).PropertyType)) { // Note: I may have gotten the IsAssignableFrom statement, above, backwards. INotifyCollectionChanged collection = this.GetType().GetProperty(e.PropertyName, BindingFlags.FlattenHierarchy).GetValue(this, null); collection.CollectionChanged += MyCollectionChanged; this.collectionNameLookup.Add(collection, e.Name); } } private void MyCollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { this.NotifyPropertyChanged(this.collectionNameLookup[sender]; } } </code></pre>
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    1. USDavid Yaw
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    1. CODavid, I just wanted to let you know I used the basis of your code that you posted above and implemented it into my Base class. Everything is working smoothly now. I definitely appreciate you taking the time to help me out with this. I'll mark this as the answer since a mixture of everything turned out to be the trick. Also, I removed the inheritance from DependencyObject and only implemented the INotify interfaces. If in the future, someone needs to see the finished code I will be glad to post it. Thanks again.
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