Index: Core/Plugins/src/Core.Plugins.OxyPlot/Legend/LegendController.cs
===================================================================
diff -u -r0d7895f07d2c1b15457ffdc8e8762780a5837030 -r4af57ec0ebbdb753668d1f7096c373672a38563f
--- Core/Plugins/src/Core.Plugins.OxyPlot/Legend/LegendController.cs	(.../LegendController.cs)	(revision 0d7895f07d2c1b15457ffdc8e8762780a5837030)
+++ Core/Plugins/src/Core.Plugins.OxyPlot/Legend/LegendController.cs	(.../LegendController.cs)	(revision 4af57ec0ebbdb753668d1f7096c373672a38563f)
@@ -35,6 +35,8 @@
         private readonly IToolViewController toolViewController;
         private IView legendView;
 
+        public EventHandler<EventArgs> OnOpenLegend;
+
         /// <summary>
         /// Creates a new instance of <see cref="LegendController"/>.
         /// </summary>
@@ -79,6 +81,10 @@
         {
             legendView = new LegendView();
             toolViewController.OpenToolView(legendView);
+            if (OnOpenLegend != null)
+            {
+                OnOpenLegend(this, EventArgs.Empty);
+            }
         }
 
         /// <summary>
Index: Core/Plugins/src/Core.Plugins.OxyPlot/OxyPlotGuiPlugin.cs
===================================================================
diff -u -r0d7895f07d2c1b15457ffdc8e8762780a5837030 -r4af57ec0ebbdb753668d1f7096c373672a38563f
--- Core/Plugins/src/Core.Plugins.OxyPlot/OxyPlotGuiPlugin.cs	(.../OxyPlotGuiPlugin.cs)	(revision 0d7895f07d2c1b15457ffdc8e8762780a5837030)
+++ Core/Plugins/src/Core.Plugins.OxyPlot/OxyPlotGuiPlugin.cs	(.../OxyPlotGuiPlugin.cs)	(revision 4af57ec0ebbdb753668d1f7096c373672a38563f)
@@ -85,9 +85,10 @@
         /// <param name="toolViewController">The <see cref="IToolViewController"/> to use for the controller
         /// <see cref="LegendController"/>.</param>
         /// <returns>A new <see cref="LegendController"/> instance.</returns>
-        private static LegendController CreateLegendController(IToolViewController toolViewController)
+        private LegendController CreateLegendController(IToolViewController toolViewController)
         {
             var controller = new LegendController(toolViewController);
+            controller.OnOpenLegend += (s,e) => UpdateComponentsForActiveView();
             return controller;
         }