Index: Riskeer/Common/src/Riskeer.Common.Forms/PresentationObjects/LocationCalculationsContext.cs
===================================================================
diff -u
--- Riskeer/Common/src/Riskeer.Common.Forms/PresentationObjects/LocationCalculationsContext.cs	(revision 0)
+++ Riskeer/Common/src/Riskeer.Common.Forms/PresentationObjects/LocationCalculationsContext.cs	(revision dd9687af655f463ca43a66dd1e94a391a41bf056)
@@ -0,0 +1,93 @@
+// Copyright (C) Stichting Deltares 2021. All rights reserved.
+//
+// This file is part of Riskeer.
+//
+// Riskeer is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using Core.Common.Base;
+using Core.Common.Controls.PresentationObjects;
+
+namespace Riskeer.Common.Forms.PresentationObjects
+{
+    public abstract class LocationCalculationsContext<TWrappedData, TObservable>
+        : WrappedObjectContextBase<TWrappedData>, IObservable
+        where TObservable : class, IObservable
+    {
+        private readonly Collection<IObserver> observers = new Collection<IObserver>();
+
+        private RecursiveObserver<ObservableList<TObservable>, TObservable> recursiveObserver;
+
+        protected LocationCalculationsContext(TWrappedData wrappedData)
+            : base(wrappedData) {}
+
+        public IEnumerable<IObserver> Observers => observers;
+
+        public virtual void Attach(IObserver observer)
+        {
+            if (!observers.Any())
+            {
+                recursiveObserver = InitializeRecursiveObserver();
+            }
+
+            observers.Add(observer);
+
+            LocationCalculationsListToObserve.Attach(observer);
+        }
+
+        public virtual void Detach(IObserver observer)
+        {
+            LocationCalculationsListToObserve.Detach(observer);
+
+            observers.Remove(observer);
+
+            if (!observers.Any())
+            {
+                recursiveObserver.Dispose();
+            }
+        }
+
+        public void NotifyObservers()
+        {
+            foreach (IObserver observer in observers)
+            {
+                try
+                {
+                    observer.UpdateObserver();
+                }
+                catch (InvalidOperationException)
+                {
+                    // Catch any exception due to inevitably updating a tree node for data that was already removed 
+                }
+            }
+        }
+
+        protected abstract ObservableList<TObservable> LocationCalculationsListToObserve { get; }
+
+        private RecursiveObserver<ObservableList<TObservable>, TObservable> InitializeRecursiveObserver()
+        {
+            return new RecursiveObserver<ObservableList<TObservable>, TObservable>(NotifyObservers, list => list)
+            {
+                Observable = LocationCalculationsListToObserve
+            };
+        }
+    }
+}
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