vault groupings page list view stubbed

src/Core/Utilities/ExtendedObservableCollection.cs

@@ -0,0 +1,37 @@
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using System.ComponentModel;
+
+namespace Bit.Core.Utilities
+{
+    public class ExtendedObservableCollection<T> : ObservableCollection<T>
+    {
+        public ExtendedObservableCollection()
+            : base() { }
+
+        public ExtendedObservableCollection(IEnumerable<T> collection)
+            : base(collection) { }
+
+        public ExtendedObservableCollection(List<T> list)
+            : base(list) { }
+
+        public void AddRange(IEnumerable<T> range)
+        {
+            foreach(var item in range)
+            {
+                Items.Add(item);
+            }
+
+            OnPropertyChanged(new PropertyChangedEventArgs("Count"));
+            OnPropertyChanged(new PropertyChangedEventArgs("Item[]"));
+            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
+        }
+
+        public void ResetWithRange(IEnumerable<T> range)
+        {
+            Items.Clear();
+            AddRange(range);
+        }
+    }
+}