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copied!<p>Opening the PresentationFramework.dll within Reflector and looking at System.Windows.Controls.ItemsControl showed the following:</p> <pre><code>public static readonly DependencyProperty ItemsSourceProperty = DependencyProperty.Register("ItemsSource", typeof(IEnumerable), typeof(ItemsControl), new FrameworkPropertyMetadata(null, new PropertyChangedCallback(ItemsControl.OnItemsSourceChanged))); private static void OnItemsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { ItemsControl control = (ItemsControl) d; IEnumerable oldValue = (IEnumerable) e.OldValue; IEnumerable newValue = (IEnumerable) e.NewValue; ItemValueStorageField.ClearValue(d); if ((e.NewValue == null) && !BindingOperations.IsDataBound(d, ItemsSourceProperty)) { control.Items.ClearItemsSource(); } else { control.Items.SetItemsSource(newValue); } control.OnItemsSourceChanged(oldValue, newValue); } </code></pre> <p>Not knowing what <code>RefreshLayout</code> does my hunch is that it has something to do with the way the <code>ObservableCollection<T></code> is being wrapped as the above code is oblivious to what the concrete collection type is and it would therefore be handled by the type being wrapped; in this case an <code>ObservableCollection<T></code> Try modifying your property as seen below to return the default view and adjust your <code>ItemsSource</code> property to be more akin to the above code from the framework and work backwards from there.</p> <pre><code>private ObservableCollection<Controls.EventCalendar.EventItem> eventItems; private ICollectionview eventsView; public System.ComponentModel.ICollectionView Events { get { if (eventsView == null) eventsView = CollectionViewSource.GetDefaultView(eventItems); return eventsView; } } </code></pre>

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