Index: Core/Common/src/Core.Common.Controls.TreeView/DragDropHandler.cs
===================================================================
diff -u -re2e9b8f56864fad784b080c62dfb0145e0c0d4b3 -ra1de055e3698f610875e623d39f4526970568cef
--- Core/Common/src/Core.Common.Controls.TreeView/DragDropHandler.cs	(.../DragDropHandler.cs)	(revision e2e9b8f56864fad784b080c62dfb0145e0c0d4b3)
+++ Core/Common/src/Core.Common.Controls.TreeView/DragDropHandler.cs	(.../DragDropHandler.cs)	(revision a1de055e3698f610875e623d39f4526970568cef)
@@ -151,13 +151,8 @@
             var treeNodeInfo = getTreeNodeInfoForData(sourceNode.Tag);
             var parentTag = sourceNode.Parent != null ? sourceNode.Parent.Tag : null;
 
-            DragOperations dragOperation = treeNodeInfo.CanDrag != null
-                                               ? treeNodeInfo.CanDrag(sourceNode.Tag, parentTag)
-                                               : DragOperations.None;
-
-            DragDropEffects effects = ToDragDropEffects(dragOperation);
-
-            if (effects == DragDropEffects.None)
+            var canDrag = treeNodeInfo.CanDrag != null && treeNodeInfo.CanDrag(sourceNode.Tag, parentTag);
+            if (!canDrag)
             {
                 return;
             }
@@ -172,7 +167,7 @@
                 dataObject.SetData(sourceNode.Tag.GetType(), sourceNode.Tag);
             }
 
-            treeView.DoDragDrop(dataObject, effects);
+            treeView.DoDragDrop(dataObject, DragDropEffects.Move);
         }
 
         public void HandleDragLeave(FormsTreeView treeView)
Index: Core/Common/src/Core.Common.Controls.TreeView/TreeNodeInfo.cs
===================================================================
diff -u -r4512af7782ee31b36941bb280b54d9da2953dd71 -ra1de055e3698f610875e623d39f4526970568cef
--- Core/Common/src/Core.Common.Controls.TreeView/TreeNodeInfo.cs	(.../TreeNodeInfo.cs)	(revision 4512af7782ee31b36941bb280b54d9da2953dd71)
+++ Core/Common/src/Core.Common.Controls.TreeView/TreeNodeInfo.cs	(.../TreeNodeInfo.cs)	(revision a1de055e3698f610875e623d39f4526970568cef)
@@ -133,7 +133,7 @@
         /// The first <c>object</c> parameter represents the data of the tree node.
         /// The second <c>object</c> parameter represents the data of the parent tree node.
         /// </summary>
-        public Func<object, object, DragOperations> CanDrag { get; set; }
+        public Func<object, object, bool> CanDrag { get; set; }
 
         /// <summary>
         /// Gets or sets a function for checking whether or not the tree node can be dropped to another location.
@@ -280,7 +280,7 @@
         /// The <typeparamref name="TData"/> parameter represents the data of the tree node.
         /// The <c>object</c> parameter represents the data of the parent tree node.
         /// </summary>
-        public Func<TData, object, DragOperations> CanDrag { get; set; }
+        public Func<TData, object, bool> CanDrag { get; set; }
 
         /// <summary>
         /// Gets or sets a function for checking whether or not the tree node can be dropped to another location.
@@ -362,7 +362,7 @@
                                     : (Action<object, object>) null,
                 CanDrag = treeNodeInfo.CanDrag != null
                               ? (tag, parentTag) => treeNodeInfo.CanDrag((TData) tag, parentTag)
-                              : (Func<object, object, DragOperations>) null,
+                              : (Func<object, object, bool>) null,
                 CanDrop = treeNodeInfo.CanDrop != null
                               ? (draggedTag, targetTag, dragOperations) => treeNodeInfo.CanDrop(draggedTag, targetTag, dragOperations)
                               : (Func<object, object, DragOperations, DragOperations>) null,
Index: Core/Plugins/src/Core.Plugins.OxyPlot/Legend/LegendView.cs
===================================================================
diff -u -r4512af7782ee31b36941bb280b54d9da2953dd71 -ra1de055e3698f610875e623d39f4526970568cef
--- Core/Plugins/src/Core.Plugins.OxyPlot/Legend/LegendView.cs	(.../LegendView.cs)	(revision 4512af7782ee31b36941bb280b54d9da2953dd71)
+++ Core/Plugins/src/Core.Plugins.OxyPlot/Legend/LegendView.cs	(.../LegendView.cs)	(revision a1de055e3698f610875e623d39f4526970568cef)
@@ -50,7 +50,7 @@
             {
                 Text = pointData => OxyPlotResources.ChartData_Point_data_label,
                 Image = pointData => OxyPlotResources.PointsIcon,
-                CanDrag = (pointData, parentData) => DragOperations.Move,
+                CanDrag = (pointData, parentData) => true,
                 CanCheck = pointData => true,
                 IsChecked = pointData => pointData.IsVisible,
                 OnNodeChecked = PointDataOnNodeChecked
@@ -60,7 +60,7 @@
             {
                 Text = lineData => OxyPlotResources.ChartData_Line_data_label,
                 Image = lineData => OxyPlotResources.LineIcon,
-                CanDrag = (lineData, parentData) => DragOperations.Move,
+                CanDrag = (lineData, parentData) => true,
                 CanCheck = lineData => true,
                 IsChecked = lineData => lineData.IsVisible,
                 OnNodeChecked = LineDataOnNodeChecked
@@ -70,7 +70,7 @@
             {
                 Text = areaData => OxyPlotResources.ChartData_Area_data_label,
                 Image = areaData => OxyPlotResources.AreaIcon,
-                CanDrag = (areaData, parentData) => DragOperations.Move,
+                CanDrag = (areaData, parentData) => true,
                 CanCheck = areaData => true,
                 IsChecked = areaData => areaData.IsVisible,
                 OnNodeChecked = AreaDataOnNodeChecked
Index: Core/Plugins/test/Core.Plugins.OxyPlot.Test/Legend/AreaDataTreeNodeInfoTest.cs
===================================================================
diff -u -r9b450b308a40796dd97a4d07b2a191973326cc96 -ra1de055e3698f610875e623d39f4526970568cef
--- Core/Plugins/test/Core.Plugins.OxyPlot.Test/Legend/AreaDataTreeNodeInfoTest.cs	(.../AreaDataTreeNodeInfoTest.cs)	(revision 9b450b308a40796dd97a4d07b2a191973326cc96)
+++ Core/Plugins/test/Core.Plugins.OxyPlot.Test/Legend/AreaDataTreeNodeInfoTest.cs	(.../AreaDataTreeNodeInfoTest.cs)	(revision a1de055e3698f610875e623d39f4526970568cef)
@@ -85,18 +85,18 @@
         }
 
         [Test]
-        public void CanDrag_Always_ReturnsDragOperationsMove()
+        public void CanDrag_Always_ReturnsTrue()
         {
             // Setup
             var areaData = mocks.StrictMock<AreaData>(Enumerable.Empty<Tuple<double, double>>());
 
             mocks.ReplayAll();
 
             // Call
-            var dragOperations = info.CanDrag(areaData, null);
+            var canDrag = info.CanDrag(areaData, null);
 
             // Assert
-            Assert.AreEqual(DragOperations.Move, dragOperations);
+            Assert.IsTrue(canDrag);
 
             mocks.VerifyAll();
         }
Index: Core/Plugins/test/Core.Plugins.OxyPlot.Test/Legend/LineDataTreeNodeInfoTest.cs
===================================================================
diff -u -r9b450b308a40796dd97a4d07b2a191973326cc96 -ra1de055e3698f610875e623d39f4526970568cef
--- Core/Plugins/test/Core.Plugins.OxyPlot.Test/Legend/LineDataTreeNodeInfoTest.cs	(.../LineDataTreeNodeInfoTest.cs)	(revision 9b450b308a40796dd97a4d07b2a191973326cc96)
+++ Core/Plugins/test/Core.Plugins.OxyPlot.Test/Legend/LineDataTreeNodeInfoTest.cs	(.../LineDataTreeNodeInfoTest.cs)	(revision a1de055e3698f610875e623d39f4526970568cef)
@@ -85,18 +85,18 @@
         }
 
         [Test]
-        public void CanDrag_Always_ReturnsDragOperationsMove()
+        public void CanDrag_Always_ReturnsTrue()
         {
             // Setup
             var lineData = mocks.StrictMock<LineData>(Enumerable.Empty<Tuple<double, double>>());
 
             mocks.ReplayAll();
 
             // Call
-            var dragOperations = info.CanDrag(lineData, null);
+            var canDrag = info.CanDrag(lineData, null);
 
             // Assert
-            Assert.AreEqual(DragOperations.Move, dragOperations);
+            Assert.IsTrue(canDrag);
 
             mocks.VerifyAll();
         }
Index: Core/Plugins/test/Core.Plugins.OxyPlot.Test/Legend/PointDataTreeNodeInfoTest.cs
===================================================================
diff -u -r9b450b308a40796dd97a4d07b2a191973326cc96 -ra1de055e3698f610875e623d39f4526970568cef
--- Core/Plugins/test/Core.Plugins.OxyPlot.Test/Legend/PointDataTreeNodeInfoTest.cs	(.../PointDataTreeNodeInfoTest.cs)	(revision 9b450b308a40796dd97a4d07b2a191973326cc96)
+++ Core/Plugins/test/Core.Plugins.OxyPlot.Test/Legend/PointDataTreeNodeInfoTest.cs	(.../PointDataTreeNodeInfoTest.cs)	(revision a1de055e3698f610875e623d39f4526970568cef)
@@ -85,18 +85,18 @@
         }
 
         [Test]
-        public void CanDrag_Always_ReturnsDragOperationsMove()
+        public void CanDrag_Always_ReturnsTrue()
         {
             // Setup
             var pointData = mocks.StrictMock<PointData>(Enumerable.Empty<Tuple<double, double>>());
 
             mocks.ReplayAll();
 
             // Call
-            var dragOperations = info.CanDrag(pointData, null);
+            var canDrag = info.CanDrag(pointData, null);
 
             // Assert
-            Assert.AreEqual(DragOperations.Move, dragOperations);
+            Assert.IsTrue(canDrag);
 
             mocks.VerifyAll();
         }
Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs
===================================================================
diff -u -r4512af7782ee31b36941bb280b54d9da2953dd71 -ra1de055e3698f610875e623d39f4526970568cef
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs	(.../PipingGuiPlugin.cs)	(revision 4512af7782ee31b36941bb280b54d9da2953dd71)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs	(.../PipingGuiPlugin.cs)	(revision a1de055e3698f610875e623d39f4526970568cef)
@@ -85,7 +85,7 @@
                 OnNodeRenamed = PipingCalculationContextOnNodeRenamed,
                 CanRemove = PipingCalculationContextCanRemove,
                 OnNodeRemoved = PipingCalculationContextOnNodeRemoved,
-                CanDrag = (pipingCalculationContext, parentData) => DragOperations.Move
+                CanDrag = (pipingCalculationContext, parentData) => true
             };
 
             yield return new TreeNodeInfo<PipingCalculationGroupContext>
@@ -692,13 +692,14 @@
             }
         }
 
-        private DragOperations PipingCalculationGroupContextCanDrag(PipingCalculationGroupContext nodeData, object parentData)
+        private bool PipingCalculationGroupContextCanDrag(PipingCalculationGroupContext nodeData, object parentData)
         {
             if (parentData is PipingFailureMechanism)
             {
-                return DragOperations.None;
+                return false;
             }
-            return DragOperations.Move;
+
+            return true;
         }
 
         private DragOperations PipingCalculationGroupContextCanDrop(object draggedData, object targetData, DragOperations validOperations)
Index: Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/TreeNodeInfos/PipingCalculationContextTreeNodeInfoTest.cs
===================================================================
diff -u -r95487d39e17289b2a656e34d85b808186222c0ee -ra1de055e3698f610875e623d39f4526970568cef
--- Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/TreeNodeInfos/PipingCalculationContextTreeNodeInfoTest.cs	(.../PipingCalculationContextTreeNodeInfoTest.cs)	(revision 95487d39e17289b2a656e34d85b808186222c0ee)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/TreeNodeInfos/PipingCalculationContextTreeNodeInfoTest.cs	(.../PipingCalculationContextTreeNodeInfoTest.cs)	(revision a1de055e3698f610875e623d39f4526970568cef)
@@ -230,13 +230,13 @@
         }
 
         [Test]
-        public void CanDrag_Always_ReturnMove()
+        public void CanDrag_Always_ReturnTrue()
         {
             // Call
-            DragOperations dragAllowed = info.CanDrag(null, null);
+            var canDrag = info.CanDrag(null, null);
 
             // Assert
-            Assert.AreEqual(DragOperations.Move, dragAllowed);
+            Assert.IsTrue(canDrag);
         }
 
         [Test]
Index: Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/TreeNodeInfos/PipingCalculationGroupContextTreeNodeInfoTest.cs
===================================================================
diff -u -r20f311390d1e8daa85500e8f031d11e9f0f5d9f4 -ra1de055e3698f610875e623d39f4526970568cef
--- Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/TreeNodeInfos/PipingCalculationGroupContextTreeNodeInfoTest.cs	(.../PipingCalculationGroupContextTreeNodeInfoTest.cs)	(revision 20f311390d1e8daa85500e8f031d11e9f0f5d9f4)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/TreeNodeInfos/PipingCalculationGroupContextTreeNodeInfoTest.cs	(.../PipingCalculationGroupContextTreeNodeInfoTest.cs)	(revision a1de055e3698f610875e623d39f4526970568cef)
@@ -74,7 +74,7 @@
         }
 
         [Test]
-        public void CanDrag_WithParentNodeDefaultBehavior_ReturnMove()
+        public void CanDrag_WithParentNodeDefaultBehavior_ReturnTrue()
         {
             // Setup
             var group = new PipingCalculationGroup();
@@ -87,14 +87,14 @@
                                                                  pipingFailureMechanismMock);
 
             // Call
-            DragOperations supportedOperation = info.CanDrag(groupContext, null);
+            var canDrag = info.CanDrag(groupContext, null);
 
             // Assert
-            Assert.AreEqual(DragOperations.Move, supportedOperation);
+            Assert.IsTrue(canDrag);
         }
 
         [Test]
-        public void CanDrag_ParentIsPipingFailureMechanism_ReturnNone()
+        public void CanDrag_ParentIsPipingFailureMechanism_ReturnFalse()
         {
             // Setup
             var pipingFailureMechanism = new PipingFailureMechanism();
@@ -108,10 +108,10 @@
                                                                  pipingFailureMechanismMock);
 
             // Call
-            DragOperations supportedOperation = info.CanDrag(groupContext, pipingFailureMechanism);
+            var canDrag = info.CanDrag(groupContext, pipingFailureMechanism);
 
             // Assert
-            Assert.AreEqual(DragOperations.None, supportedOperation);
+            Assert.IsFalse(canDrag);
         }
 
         [Test]