ListView Layout Manager modification

        // ADD this variable to the class:
        private INotifyCollectionChanged prevListViewItemsSource;

        public ListViewLayoutManager(ListView listView)
        {
            if ( listView == null )
            {
                throw new ArgumentNullException( "listView" );
            }

            this.listView = listView;
            this.listView.Loaded += new RoutedEventHandler( ListViewLoaded );
            this.listView.Unloaded += new RoutedEventHandler( ListViewUnloaded );

            // ADD from the following lines and methods:
            DependencyPropertyDescriptor dpd =
                DependencyPropertyDescriptor.FromProperty(ListView.ItemsSourceProperty, typeof(ListView));
            dpd.AddValueChanged(this.listView, ListViewItemsSourceChanged);
            ListViewItemsSourceChanged(null, null);
        } // ListViewLayoutManager

        private void ListViewItemsSourceChanged(object sender, EventArgs e)
        {
            if (prevListViewItemsSource != null)
            {
                prevListViewItemsSource.CollectionChanged -= source_CollectionChanged;
            }
            var source = listView.ItemsSource as INotifyCollectionChanged;
            prevListViewItemsSource = source;
            if (source != null)
            {
                source.CollectionChanged += source_CollectionChanged;
            }
        }

        private void source_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            ResetColumnWidths();

            switch (e.Action)
            {
                case NotifyCollectionChangedAction.Add:
                    foreach (object o in e.NewItems)
                    {
                        var item = o as INotifyPropertyChanged;
                        if (item != null)
                        {
                            item.PropertyChanged += item_PropertyChanged;
                        }
                    }
                    break;
                case NotifyCollectionChangedAction.Remove:
                    foreach (object o in e.OldItems)
                    {
                        var item = o as INotifyPropertyChanged;
                        if (item != null)
                        {
                            item.PropertyChanged -= item_PropertyChanged;
                        }
                    }
                    break;
                case NotifyCollectionChangedAction.Replace:
                    foreach (object o in e.OldItems)
                    {
                        var item = o as INotifyPropertyChanged;
                        if (item != null)
                        {
                            item.PropertyChanged -= item_PropertyChanged;
                        }
                    }
                    foreach (object o in e.NewItems)
                    {
                        var item = o as INotifyPropertyChanged;
                        if (item != null)
                        {
                            item.PropertyChanged += item_PropertyChanged;
                        }
                    }
                    break;
                case NotifyCollectionChangedAction.Reset:
                    var list = sender as IEnumerable;
                    if (list != null)
                    {
                        foreach (object o in list)
                        {
                            var item = o as INotifyPropertyChanged;
                            if (item != null)
                            {
                                item.PropertyChanged += item_PropertyChanged;
                            }
                        }
                    }
                    break;
            }
        }

        private void item_PropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            ResetColumnWidths();
        }

        private void ResetColumnWidths()
        {
            Dispatcher.CurrentDispatcher.BeginInvoke((Action) (() =>
            {
                GridView view = listView.View as GridView;
                if (view != null)
                {
                    listView.UpdateLayout();   // Prevent flickering on expanding columns (not collapsing though)
                    foreach (GridViewColumn gridViewColumn in view.Columns)
                    {
                        bool? isFillColumn = RangeColumn.GetRangeIsFillColumn(gridViewColumn);
                        if (!isFillColumn.HasValue || !isFillColumn.Value)
                        {
                            if (double.IsNaN(gridViewColumn.Width))
                            {
                                gridViewColumn.Width = gridViewColumn.ActualWidth;
                                gridViewColumn.Width = double.NaN;
                            }
                        }
                    }
                }
                Dispatcher.CurrentDispatcher.BeginInvoke((Action) Refresh, DispatcherPriority.Render);
            }), DispatcherPriority.Render);
        }