Index: Core/Common/src/Core.Common.Gui/Core.Common.Gui.csproj
===================================================================
diff -u -r231804c353b32db8e1421cfb776801a9b0677541 -ra670d0895ffaba9ace8c0c6e5f9a10103e61a205
--- Core/Common/src/Core.Common.Gui/Core.Common.Gui.csproj	(.../Core.Common.Gui.csproj)	(revision 231804c353b32db8e1421cfb776801a9b0677541)
+++ Core/Common/src/Core.Common.Gui/Core.Common.Gui.csproj	(.../Core.Common.Gui.csproj)	(revision a670d0895ffaba9ace8c0c6e5f9a10103e61a205)
@@ -129,6 +129,7 @@
     <Compile Include="..\Core.Common.Version\GlobalAssembly.cs">
       <Link>Properties\GlobalAssembly.cs</Link>
     </Compile>
+    <Compile Include="Forms\ProgressDialog\ActivityProgressDialogRunner.cs" />
     <Compile Include="Commands\MainWindowCommands.cs" />
     <Compile Include="ContextMenu\ContextMenuBuilder.cs" />
     <Compile Include="ContextMenu\StrictContextMenuItem.cs">
Index: Core/Common/src/Core.Common.Gui/Forms/ProgressDialog/ActivityProgressDialogRunner.cs
===================================================================
diff -u
--- Core/Common/src/Core.Common.Gui/Forms/ProgressDialog/ActivityProgressDialogRunner.cs	(revision 0)
+++ Core/Common/src/Core.Common.Gui/Forms/ProgressDialog/ActivityProgressDialogRunner.cs	(revision a670d0895ffaba9ace8c0c6e5f9a10103e61a205)
@@ -0,0 +1,19 @@
+using System.Collections.Generic;
+using Core.Common.Base.Workflow;
+using Core.Common.Controls.Swf;
+
+namespace Core.Common.Gui.Forms.ProgressDialog
+{
+    public static class ActivityProgressDialogRunner
+    {
+        public static void Run(IActivity activity)
+        {
+            Run(new[] { activity });
+        }
+
+        public static void Run(IEnumerable<IActivity> activities)
+        {
+            ModalHelper.ShowModal(new ActivityProgressDialog(activities));
+        }
+    }
+}
Index: Ringtoets/Piping/src/Ringtoets.Piping.Forms/NodePresenters/PipingFailureMechanismNodePresenter.cs
===================================================================
diff -u -reb7f8fe1e85f00faf16a1cddef014728d60a2b19 -ra670d0895ffaba9ace8c0c6e5f9a10103e61a205
--- Ringtoets/Piping/src/Ringtoets.Piping.Forms/NodePresenters/PipingFailureMechanismNodePresenter.cs	(.../PipingFailureMechanismNodePresenter.cs)	(revision eb7f8fe1e85f00faf16a1cddef014728d60a2b19)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Forms/NodePresenters/PipingFailureMechanismNodePresenter.cs	(.../PipingFailureMechanismNodePresenter.cs)	(revision a670d0895ffaba9ace8c0c6e5f9a10103e61a205)
@@ -31,9 +31,9 @@
         public IContextMenuBuilderProvider ContextMenuBuilderProvider { get; set; }
 
         /// <summary>
-        /// Injection points for a method to cause an <see cref="IActivity"/> to be scheduled for execution.
+        /// Injection points for a method to cause a collection of <see cref="IActivity"/> to be scheduled for execution.
         /// </summary>
-        public Action<IActivity> RunActivityAction { private get; set; }
+        public Action<IEnumerable<IActivity>> RunActivitiesAction { private get; set; }
 
         protected override void UpdateNode(ITreeNode parentNode, ITreeNode node, PipingFailureMechanism nodeData)
         {
@@ -116,10 +116,7 @@
 
         private void CalculateAll(PipingFailureMechanism failureMechanism)
         {
-            foreach (PipingCalculation calc in GetAllPipingCalculationsResursively(failureMechanism))
-            {
-                RunActivityAction(new PipingCalculationActivity(calc));
-            }
+            RunActivitiesAction(GetAllPipingCalculationsResursively(failureMechanism).Select(calc => new PipingCalculationActivity(calc)));
         }
 
         private static void AddCalculationGroup(PipingFailureMechanism failureMechanism)
Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs
===================================================================
diff -u -reb7f8fe1e85f00faf16a1cddef014728d60a2b19 -ra670d0895ffaba9ace8c0c6e5f9a10103e61a205
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs	(.../PipingGuiPlugin.cs)	(revision eb7f8fe1e85f00faf16a1cddef014728d60a2b19)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs	(.../PipingGuiPlugin.cs)	(revision a670d0895ffaba9ace8c0c6e5f9a10103e61a205)
@@ -2,7 +2,7 @@
 using Core.Common.Controls;
 using Core.Common.Gui;
 using Core.Common.Gui.Forms;
-
+using Core.Common.Gui.Forms.ProgressDialog;
 using Ringtoets.Piping.Data;
 
 using Ringtoets.Piping.Forms.NodePresenters;
@@ -35,13 +35,13 @@
         {
             yield return new PipingCalculationContextNodePresenter
             {
-                RunActivityAction = Gui.ActivityRunner.Enqueue
+                RunActivityAction = ActivityProgressDialogRunner.Run
             };
             yield return new PipingCalculationGroupContextNodePresenter();
             yield return new PipingInputContextNodePresenter();
-            yield return new PipingFailureMechanismNodePresenter()
+            yield return new PipingFailureMechanismNodePresenter
             {
-                RunActivityAction = Gui.ActivityRunner.Enqueue,
+                RunActivitiesAction = ActivityProgressDialogRunner.Run,
                 ContextMenuBuilderProvider = Gui.ContextMenuProvider
             };
             yield return new PipingSurfaceLineCollectionNodePresenter