Index: Core/Components/src/Core.Components.Charting/Data/AreaData.cs
===================================================================
diff -u -rba3f5abc18676f64d95d75270494424f169b3c4e -r6bada2c69339af216d3eab757e7f291bfdf82df3
--- Core/Components/src/Core.Components.Charting/Data/AreaData.cs	(.../AreaData.cs)	(revision ba3f5abc18676f64d95d75270494424f169b3c4e)
+++ Core/Components/src/Core.Components.Charting/Data/AreaData.cs	(.../AreaData.cs)	(revision 6bada2c69339af216d3eab757e7f291bfdf82df3)
@@ -23,6 +23,7 @@
                 throw new ArgumentNullException("points", "A point collection is required when creating AreaData.");
             }
             Points = points.ToArray();
+            IsVisible = true;
         }
 
         public bool IsVisible { get; set; }
Index: Core/Components/src/Core.Components.Charting/Data/LineData.cs
===================================================================
diff -u -rba3f5abc18676f64d95d75270494424f169b3c4e -r6bada2c69339af216d3eab757e7f291bfdf82df3
--- Core/Components/src/Core.Components.Charting/Data/LineData.cs	(.../LineData.cs)	(revision ba3f5abc18676f64d95d75270494424f169b3c4e)
+++ Core/Components/src/Core.Components.Charting/Data/LineData.cs	(.../LineData.cs)	(revision 6bada2c69339af216d3eab757e7f291bfdf82df3)
@@ -23,6 +23,7 @@
                 throw new ArgumentNullException("points", "A point collection is required when creating ChartData.");
             }
             Points = points.ToArray();
+            IsVisible = true;
         }
 
         public bool IsVisible { get; set; }
Index: Core/Components/src/Core.Components.Charting/Data/PointData.cs
===================================================================
diff -u -rba3f5abc18676f64d95d75270494424f169b3c4e -r6bada2c69339af216d3eab757e7f291bfdf82df3
--- Core/Components/src/Core.Components.Charting/Data/PointData.cs	(.../PointData.cs)	(revision ba3f5abc18676f64d95d75270494424f169b3c4e)
+++ Core/Components/src/Core.Components.Charting/Data/PointData.cs	(.../PointData.cs)	(revision 6bada2c69339af216d3eab757e7f291bfdf82df3)
@@ -22,6 +22,7 @@
                 throw new ArgumentNullException("points", "A point collection is required when creating PointData.");
             }
             Points = points.ToArray();
+            IsVisible = true;
         }
 
         public bool IsVisible { get; set; }
Index: Core/Plugins/src/Core.Plugins.OxyPlot/Legend/ChartDataNodePresenter.cs
===================================================================
diff -u -rba3f5abc18676f64d95d75270494424f169b3c4e -r6bada2c69339af216d3eab757e7f291bfdf82df3
--- Core/Plugins/src/Core.Plugins.OxyPlot/Legend/ChartDataNodePresenter.cs	(.../ChartDataNodePresenter.cs)	(revision ba3f5abc18676f64d95d75270494424f169b3c4e)
+++ Core/Plugins/src/Core.Plugins.OxyPlot/Legend/ChartDataNodePresenter.cs	(.../ChartDataNodePresenter.cs)	(revision 6bada2c69339af216d3eab757e7f291bfdf82df3)
@@ -32,7 +32,7 @@
                 throw new NotSupportedException("Cannot add chart data of type other than points, lines or area.");
             }
             node.ShowCheckBox = true;
-            node.Checked = true;
+            node.Checked = nodeData.IsVisible;
         }
 
         public override void OnNodeChecked(TreeNode node)