Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs
===================================================================
diff -u -ree395d64328db8f999b871e80491399a0a65e844 -r675f279fbcb7a1204f43c7de50be373cde96ca2e
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs	(.../GrassCoverErosionOutwardsPlugin.cs)	(revision ee395d64328db8f999b871e80491399a0a65e844)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs	(.../GrassCoverErosionOutwardsPlugin.cs)	(revision 675f279fbcb7a1204f43c7de50be373cde96ca2e)
@@ -109,7 +109,7 @@
             yield return RingtoetsTreeNodeInfoFactory.CreateCalculationGroupContextTreeNodeInfo<GrassCoverErosionOutwardsWaveConditionsCalculationGroupContext>(
                 WaveConditionsCalculationGroupChildeNodeObjects,
                 WaveConditionsCalculationGroupContextMenuStrip,
-                null);
+                WaveConditionsCalculationGroupContextOnNodeRemoved);
 
             yield return RingtoetsTreeNodeInfoFactory.CreateCalculationContextTreeNodeInfo<GrassCoverErosionOutwardsWaveConditionsCalculationContext>(
                 RingtoetsGrassCoverErosionOutwardsFormsResources.CalculationIcon,
@@ -562,6 +562,16 @@
             }
         }
 
+        private void WaveConditionsCalculationGroupContextOnNodeRemoved(GrassCoverErosionOutwardsWaveConditionsCalculationGroupContext nodeData,
+                                                                        object parentNodeData)
+        {
+            var parentGroupContext = (GrassCoverErosionOutwardsWaveConditionsCalculationGroupContext) parentNodeData;
+
+            parentGroupContext.WrappedData.Children.Remove(nodeData.WrappedData);
+
+            parentGroupContext.NotifyObservers();
+        }
+
         #endregion
 
         #endregion