Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs
===================================================================
diff -u -r79279d5d69482de69ef6b4be98ad53e666ab06e2 -rba310454172ed29499474b2f8b013fa0f0c523b8
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs	(.../GrassCoverErosionInwardsGuiPlugin.cs)	(revision 79279d5d69482de69ef6b4be98ad53e666ab06e2)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs	(.../GrassCoverErosionInwardsGuiPlugin.cs)	(revision ba310454172ed29499474b2f8b013fa0f0c523b8)
@@ -329,7 +329,7 @@
             CalculationTreeNodeInfoFactory.AddCreateCalculationItem(builder, nodeData, AddCalculation);
             builder.AddSeparator();
 
-            CalculationTreeNodeInfoFactory.AddPerformAllCalculationsInGroupItem(builder, group, context => { }); // TODO: Actualy connect the calculation
+            CalculationTreeNodeInfoFactory.AddPerformAllCalculationsInGroupItem(builder, group, nodeData, CalculateAll);
             CalculationTreeNodeInfoFactory.AddClearAllCalculationOutputInGroupItem(builder, group);
             builder.AddSeparator();
 
@@ -359,6 +359,18 @@
             parentGroupContext.NotifyObservers();
         }
 
+        private void CalculateAll(CalculationGroup group, GrassCoverErosionInwardsCalculationGroupContext context)
+        {
+            ActivityProgressDialogRunner.Run(Gui.MainWindow, group.GetCalculations()
+                .OfType<GrassCoverErosionInwardsCalculation>()
+                .Select(calc =>
+                    CreateHydraRingTargetProbabilityCalculationActivity(
+                        context.FailureMechanism.Sections.First(), // TODO: Pass dike section based on cross section of calculation with reference line
+                        calc.InputParameters.HydraulicBoundaryLocation,
+                        context.AssessmentSection.HydraulicBoundaryDatabase.FilePath,
+                        calc)));
+        }
+
         #endregion
 
         #region CalculationContext TreeNodeInfo