Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs
===================================================================
diff -u -r14185c4e29bcfc887fa656a681bdde704d250a9f -r63fbdd5525927fbf9d63925eef9da8e17a0d7b44
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs	(.../PipingGuiPlugin.cs)	(revision 14185c4e29bcfc887fa656a681bdde704d250a9f)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs	(.../PipingGuiPlugin.cs)	(revision 63fbdd5525927fbf9d63925eef9da8e17a0d7b44)
@@ -155,8 +155,8 @@
             {
                 Text = ringtoetsPipingSurfaceLine => PipingFormsResources.PipingSurfaceLinesCollection_DisplayName,
                 Image = ringtoetsPipingSurfaceLine => RingtoetsCommonFormsResources.GeneralFolderIcon,
-                ForeColor = ringtoetsPipingSurfaceLine => ringtoetsPipingSurfaceLine.FailureMechanism.SurfaceLines.Any() ? Color.FromKnownColor(KnownColor.ControlText) : Color.FromKnownColor(KnownColor.GrayText),
-                ChildNodeObjects = ringtoetsPipingSurfaceLine => ringtoetsPipingSurfaceLine.FailureMechanism.SurfaceLines.Cast<object>().ToArray(),
+                ForeColor = ringtoetsPipingSurfaceLine => ringtoetsPipingSurfaceLine.WrappedData.SurfaceLines.Any() ? Color.FromKnownColor(KnownColor.ControlText) : Color.FromKnownColor(KnownColor.GrayText),
+                ChildNodeObjects = ringtoetsPipingSurfaceLine => ringtoetsPipingSurfaceLine.WrappedData.SurfaceLines.Cast<object>().ToArray(),
                 ContextMenuStrip = (nodeData, parentData, treeViewControl) => Gui.Get(nodeData, treeViewControl)
                                                                                  .AddImportItem()
                                                                                  .AddExportItem()