Index: Riskeer/DuneErosion/src/Riskeer.DuneErosion.Plugin/DuneErosionPlugin.cs
===================================================================
diff -u -rf74baad41c48a49df1b49deabdeab6f26b662fd2 -r23b50eecc9b263dbe0edae0f6955895863c48d7c
--- Riskeer/DuneErosion/src/Riskeer.DuneErosion.Plugin/DuneErosionPlugin.cs	(.../DuneErosionPlugin.cs)	(revision f74baad41c48a49df1b49deabdeab6f26b662fd2)
+++ Riskeer/DuneErosion/src/Riskeer.DuneErosion.Plugin/DuneErosionPlugin.cs	(.../DuneErosionPlugin.cs)	(revision 23b50eecc9b263dbe0edae0f6955895863c48d7c)
@@ -117,7 +117,10 @@
                                            : Color.FromKnownColor(KnownColor.GrayText),
                 Image = context => RiskeerCommonFormsResources.GeneralFolderIcon,
                 ContextMenuStrip = DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContextMenuStrip,
-                ChildNodeObjects = DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContextChildNodeObjects
+                ChildNodeObjects = DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContextChildNodeObjects,
+                CanInsert = DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext_CanDropOrInsert,
+                CanDrop = DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext_CanDropOrInsert,
+                OnDrop = DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext_OnDrop
             };
 
             yield return new TreeNodeInfo<DuneLocationCalculationsForUserDefinedTargetProbabilityContext>
@@ -426,6 +429,25 @@
             return hydraulicBoundaryLocationCalculationsForTargetProbability;
         }
 
+        private static bool DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext_CanDropOrInsert(object draggedData, object targetData)
+        {
+            var duneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext = (DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext) targetData;
+
+            return draggedData is DuneLocationCalculationsForUserDefinedTargetProbabilityContext duneLocationCalculationsForUserDefinedTargetProbabilityContext
+                   && duneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext.WrappedData.Contains(duneLocationCalculationsForUserDefinedTargetProbabilityContext.WrappedData);
+        }
+
+        private static void DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext_OnDrop(object droppedData, object newParentData, object oldParentData, int position, TreeViewControl treeViewControl)
+        {
+            var duneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext = (DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext) newParentData;
+            var duneLocationCalculationsForUserDefinedTargetProbabilityContext = (DuneLocationCalculationsForUserDefinedTargetProbabilityContext) droppedData;
+
+            duneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext.WrappedData.Remove(
+                duneLocationCalculationsForUserDefinedTargetProbabilityContext.WrappedData);
+            duneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext.WrappedData.Insert(
+                position, duneLocationCalculationsForUserDefinedTargetProbabilityContext.WrappedData);
+        }
+
         #endregion
 
         #region DuneLocationCalculationsForUserDefinedTargetProbabilityContext TreeNodeInfo
Index: Riskeer/DuneErosion/test/Riskeer.DuneErosion.Plugin.Test/TreeNodeInfos/DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContextTreeNodeInfoTest.cs
===================================================================
diff -u -r2b7b2aa2685cda206eddef667f6d5ab37423ecd0 -r23b50eecc9b263dbe0edae0f6955895863c48d7c
--- Riskeer/DuneErosion/test/Riskeer.DuneErosion.Plugin.Test/TreeNodeInfos/DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContextTreeNodeInfoTest.cs	(.../DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContextTreeNodeInfoTest.cs)	(revision 2b7b2aa2685cda206eddef667f6d5ab37423ecd0)
+++ Riskeer/DuneErosion/test/Riskeer.DuneErosion.Plugin.Test/TreeNodeInfos/DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContextTreeNodeInfoTest.cs	(.../DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContextTreeNodeInfoTest.cs)	(revision 23b50eecc9b263dbe0edae0f6955895863c48d7c)
@@ -82,9 +82,9 @@
                 Assert.IsNull(info.CheckedState);
                 Assert.IsNull(info.OnNodeChecked);
                 Assert.IsNull(info.CanDrag);
-                Assert.IsNull(info.CanDrop);
-                Assert.IsNull(info.CanInsert);
-                Assert.IsNull(info.OnDrop);
+                Assert.IsNotNull(info.CanDrop);
+                Assert.IsNotNull(info.CanInsert);
+                Assert.IsNotNull(info.OnDrop);
             }
         }
 
@@ -603,6 +603,217 @@
             mocks.VerifyAll();
         }
 
+        [Test]
+        public void CanInsert_DraggedDataOfUnsupportedDataType_ReturnsFalse()
+        {
+            // Setup
+            using (var plugin = new DuneErosionPlugin())
+            {
+                TreeNodeInfo info = GetInfo(plugin);
+
+                var targetData = new DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext(
+                    new ObservableList<DuneLocationCalculationsForTargetProbability>(),
+                    new DuneErosionFailureMechanism(),
+                    new AssessmentSectionStub());
+
+                // Call
+                bool canInsert = info.CanInsert(new object(), targetData);
+
+                // Assert
+                Assert.IsFalse(canInsert);
+            }
+        }
+
+        [Test]
+        public void CanInsert_DraggedDataNotPartOfGroupContext_ReturnsFalse()
+        {
+            // Setup
+            using (var plugin = new DuneErosionPlugin())
+            {
+                TreeNodeInfo info = GetInfo(plugin);
+
+                var assessmentSectionStub = new AssessmentSectionStub();
+                var failureMechanism = new DuneErosionFailureMechanism();
+
+                var targetData = new DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext(
+                    new ObservableList<DuneLocationCalculationsForTargetProbability>(),
+                    failureMechanism,
+                    assessmentSectionStub);
+
+                var draggedData = new DuneLocationCalculationsForUserDefinedTargetProbabilityContext(
+                    new DuneLocationCalculationsForTargetProbability(),
+                    failureMechanism,
+                    assessmentSectionStub);
+
+                // Call
+                bool canInsert = info.CanInsert(draggedData, targetData);
+
+                // Assert
+                Assert.IsFalse(canInsert);
+            }
+        }
+
+        [Test]
+        public void CanInsert_DraggedDataPartOfGroupContext_ReturnsTrue()
+        {
+            // Setup
+            using (var plugin = new DuneErosionPlugin())
+            {
+                TreeNodeInfo info = GetInfo(plugin);
+
+                var assessmentSectionStub = new AssessmentSectionStub();
+                var failureMechanism = new DuneErosionFailureMechanism();
+                var calculationsForTargetProbability = new DuneLocationCalculationsForTargetProbability();
+
+                var targetData = new DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext(
+                    new ObservableList<DuneLocationCalculationsForTargetProbability>
+                    {
+                        calculationsForTargetProbability
+                    },
+                    failureMechanism,
+                    assessmentSectionStub);
+
+                var draggedData = new DuneLocationCalculationsForUserDefinedTargetProbabilityContext(
+                    calculationsForTargetProbability,
+                    failureMechanism,
+                    assessmentSectionStub);
+
+                // Call
+                bool canInsert = info.CanInsert(draggedData, targetData);
+
+                // Assert
+                Assert.IsTrue(canInsert);
+            }
+        }
+
+        [Test]
+        public void CanDrop_DraggedDataOfUnsupportedDataType_ReturnsFalse()
+        {
+            // Setup
+            using (var plugin = new DuneErosionPlugin())
+            {
+                TreeNodeInfo info = GetInfo(plugin);
+
+                var targetData = new DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext(
+                    new ObservableList<DuneLocationCalculationsForTargetProbability>(),
+                    new DuneErosionFailureMechanism(),
+                    new AssessmentSectionStub());
+
+                // Call
+                bool canDrop = info.CanDrop(new object(), targetData);
+
+                // Assert
+                Assert.IsFalse(canDrop);
+            }
+        }
+
+        [Test]
+        public void CanDrop_DraggedDataNotPartOfGroupContext_ReturnsFalse()
+        {
+            // Setup
+            using (var plugin = new DuneErosionPlugin())
+            {
+                TreeNodeInfo info = GetInfo(plugin);
+
+                var assessmentSectionStub = new AssessmentSectionStub();
+                var failureMechanism = new DuneErosionFailureMechanism();
+
+                var targetData = new DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext(
+                    new ObservableList<DuneLocationCalculationsForTargetProbability>(),
+                    failureMechanism,
+                    assessmentSectionStub);
+
+                var draggedData = new DuneLocationCalculationsForUserDefinedTargetProbabilityContext(
+                    new DuneLocationCalculationsForTargetProbability(),
+                    failureMechanism,
+                    assessmentSectionStub);
+
+                // Call
+                bool canDrop = info.CanDrop(draggedData, targetData);
+
+                // Assert
+                Assert.IsFalse(canDrop);
+            }
+        }
+
+        [Test]
+        public void CanDrop_DraggedDataPartOfGroupContext_ReturnsTrue()
+        {
+            // Setup
+            using (var plugin = new DuneErosionPlugin())
+            {
+                TreeNodeInfo info = GetInfo(plugin);
+
+                var assessmentSectionStub = new AssessmentSectionStub();
+                var failureMechanism = new DuneErosionFailureMechanism();
+                var calculationsForTargetProbability = new DuneLocationCalculationsForTargetProbability();
+
+                var targetData = new DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext(
+                    new ObservableList<DuneLocationCalculationsForTargetProbability>
+                    {
+                        calculationsForTargetProbability
+                    },
+                    failureMechanism,
+                    assessmentSectionStub);
+
+                var draggedData = new DuneLocationCalculationsForUserDefinedTargetProbabilityContext(
+                    calculationsForTargetProbability,
+                    failureMechanism,
+                    assessmentSectionStub);
+
+                // Call
+                bool canDrop = info.CanDrop(draggedData, targetData);
+
+                // Assert
+                Assert.IsTrue(canDrop);
+            }
+        }
+
+        [Test]
+        public void OnDrop_DataDroppedToDifferentIndex_DroppedDataCorrectlyMoved()
+        {
+            // Setup
+            using (var plugin = new DuneErosionPlugin())
+            {
+                TreeNodeInfo info = GetInfo(plugin);
+
+                var assessmentSectionStub = new AssessmentSectionStub();
+                var failureMechanism = new DuneErosionFailureMechanism();
+
+                var calculationsForTargetProbability1 = new DuneLocationCalculationsForTargetProbability();
+                var calculationsForTargetProbability2 = new DuneLocationCalculationsForTargetProbability();
+                var calculationsForTargetProbability3 = new DuneLocationCalculationsForTargetProbability();
+
+                var calculationsForTargetProbabilities = new ObservableList<DuneLocationCalculationsForTargetProbability>
+                {
+                    calculationsForTargetProbability1,
+                    calculationsForTargetProbability2,
+                    calculationsForTargetProbability3
+                };
+
+                var parentData = new DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext(
+                    calculationsForTargetProbabilities,
+                    failureMechanism,
+                    assessmentSectionStub);
+
+                var droppedData = new DuneLocationCalculationsForUserDefinedTargetProbabilityContext(
+                    calculationsForTargetProbability3,
+                    failureMechanism,
+                    assessmentSectionStub);
+
+                // Call
+                info.OnDrop(droppedData, parentData, parentData, 1, null);
+
+                // Assert
+                CollectionAssert.AreEquivalent(new[]
+                {
+                    calculationsForTargetProbability1,
+                    calculationsForTargetProbability3,
+                    calculationsForTargetProbability2
+                }, calculationsForTargetProbabilities);
+            }
+        }
+
         private static TreeNodeInfo GetInfo(DuneErosionPlugin plugin)
         {
             return plugin.GetTreeNodeInfos().First(tni => tni.TagType == typeof(DuneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext));