Index: Core/Gui/src/Core.Gui/Forms/MainWindow/MainWindow.xaml.cs
===================================================================
diff -u -r3a3cef57bc0976a433e34bac53dc3790435d9d7d -r6d127df298d3bc96c2690a6e3b3361fc4560583f
--- Core/Gui/src/Core.Gui/Forms/MainWindow/MainWindow.xaml.cs	(.../MainWindow.xaml.cs)	(revision 3a3cef57bc0976a433e34bac53dc3790435d9d7d)
+++ Core/Gui/src/Core.Gui/Forms/MainWindow/MainWindow.xaml.cs	(.../MainWindow.xaml.cs)	(revision 6d127df298d3bc96c2690a6e3b3361fc4560583f)
@@ -276,12 +276,6 @@
             SetGui(null);
         }
 
-        /// <summary>
-        /// Adds a state button to the <see cref="MainButtonStackPanel"/>.
-        /// </summary>
-        /// <param name="text">The text of the button.</param>
-        /// <param name="symbol">The symbol of the button.</param>
-        /// <param name="getRootData">The method for obtaining the root data of the state.</param>
         internal void AddStateButton(string text, string symbol, Func<IProject, object> getRootData)
         {
             var stateToggleButton = new ToggleButton
Index: Core/Gui/test/Core.Gui.TestUtil/TestPlugin.cs
===================================================================
diff -u -r4657c1cd3629ca7330a5e9da02bcec60127509f3 -r6d127df298d3bc96c2690a6e3b3361fc4560583f
--- Core/Gui/test/Core.Gui.TestUtil/TestPlugin.cs	(.../TestPlugin.cs)	(revision 4657c1cd3629ca7330a5e9da02bcec60127509f3)
+++ Core/Gui/test/Core.Gui.TestUtil/TestPlugin.cs	(.../TestPlugin.cs)	(revision 6d127df298d3bc96c2690a6e3b3361fc4560583f)
@@ -35,5 +35,10 @@
         {
             yield return new TreeNodeInfo<IProject>();
         }
+
+        public override IEnumerable<StateInfo> GetStateInfos()
+        {
+            yield return new StateInfo("Name", "Symbol", project => project);
+        }
     }
 }
\ No newline at end of file