Index: Core/Common/src/Core.Common.Gui/GuiCore.cs
===================================================================
diff -u -r77c0ac1bef69ef7d39d3c05673a015f692b2f71b -r219cfb0a4817b990ca5e7a63b8670effe61669f7
--- Core/Common/src/Core.Common.Gui/GuiCore.cs	(.../GuiCore.cs)	(revision 77c0ac1bef69ef7d39d3c05673a015f692b2f71b)
+++ Core/Common/src/Core.Common.Gui/GuiCore.cs	(.../GuiCore.cs)	(revision 219cfb0a4817b990ca5e7a63b8670effe61669f7)
@@ -125,6 +125,7 @@
             ViewPropertyEditor.ViewCommands = ViewCommands;
 
             ProjectOpened += ApplicationProjectOpened;
+            BeforeProjectOpened += ApplicationBeforeProjectOpened;
             projectObserver = new Observer(UpdateTitle);
 
             Project = projectFactory.CreateNewProject();
@@ -378,11 +379,15 @@
                 mainWindow.ValidateItems();
             }
 
-            ViewCommands.RemoveAllViewsForItem(project);
-            projectObserver.Observable = project;
+            projectObserver.Observable = newProject;
             UpdateTitle();
         }
 
+        private void ApplicationBeforeProjectOpened(IProject oldProject)
+        {
+            ViewCommands.RemoveAllViewsForItem(project);
+        }
+
         private static void ConfigureLogging()
         {
             // configure logging
@@ -585,6 +590,7 @@
         #region Implementation: IProjectOwner
 
         private IProject project;
+        public event Action<IProject> BeforeProjectOpened;
         public event Action<IProject> ProjectOpened;
 
         public string ProjectFilePath { get; private set; }
@@ -604,12 +610,21 @@
 
                 if (!ReferenceEquals(project, value))
                 {
+                    OnBeforeProjectOpened();
                     project = value;
                     OnProjectOpened();
                 }
             }
         }
 
+        private void OnBeforeProjectOpened()
+        {
+            if (BeforeProjectOpened != null)
+            {
+                BeforeProjectOpened(project);
+            }
+        }
+
         private void OnProjectOpened()
         {
             if (ProjectOpened != null)
Index: Core/Common/src/Core.Common.Gui/IProjectOwner.cs
===================================================================
diff -u -r0be8a14b7c545ae5a07d1da6a0fa70829323b0f2 -r219cfb0a4817b990ca5e7a63b8670effe61669f7
--- Core/Common/src/Core.Common.Gui/IProjectOwner.cs	(.../IProjectOwner.cs)	(revision 0be8a14b7c545ae5a07d1da6a0fa70829323b0f2)
+++ Core/Common/src/Core.Common.Gui/IProjectOwner.cs	(.../IProjectOwner.cs)	(revision 219cfb0a4817b990ca5e7a63b8670effe61669f7)
@@ -30,8 +30,13 @@
     public interface IProjectOwner
     {
         /// <summary>
-        /// Occurs when a new instance is available at <see cref="IProject"/>.
+        /// Occurs just before a new instance is available at <see cref="Project"/>.
         /// </summary>
+        event Action<IProject> BeforeProjectOpened;
+
+        /// <summary>
+        /// Occurs when a new instance is available at <see cref="Project"/>.
+        /// </summary>
         event Action<IProject> ProjectOpened;
 
         /// <summary>
Index: Core/Common/test/Core.Common.Gui.Test/GuiCoreTest.cs
===================================================================
diff -u -r0be8a14b7c545ae5a07d1da6a0fa70829323b0f2 -r219cfb0a4817b990ca5e7a63b8670effe61669f7
--- Core/Common/test/Core.Common.Gui.Test/GuiCoreTest.cs	(.../GuiCoreTest.cs)	(revision 0be8a14b7c545ae5a07d1da6a0fa70829323b0f2)
+++ Core/Common/test/Core.Common.Gui.Test/GuiCoreTest.cs	(.../GuiCoreTest.cs)	(revision 219cfb0a4817b990ca5e7a63b8670effe61669f7)
@@ -1000,27 +1000,33 @@
             // Setup
             var mocks = new MockRepository();
             var storeProject = mocks.Stub<IStoreProject>();
-            var projectFactory = CreateProjectFactory(mocks);
-            var oldProjectMock = mocks.Stub<IProject>();
-            var newProjectMock = mocks.Stub<IProject>();
+            var oldProject = mocks.Stub<IProject>();
+            var newProject = mocks.Stub<IProject>();
+            var projectFactory = mocks.Stub<IProjectFactory>();
+            projectFactory.Stub(pf => pf.CreateNewProject()).Return(oldProject);
             mocks.ReplayAll();
 
             using (var gui = new GuiCore(new MainWindow(), storeProject, projectFactory, new GuiCoreSettings()))
             {
-                gui.SetProject(oldProjectMock, null);
-
                 int openedCallCount = 0;
+                int beforeOpenCallCount = 0;
+                gui.BeforeProjectOpened += project =>
+                {
+                    Assert.AreSame(oldProject, project);
+                    beforeOpenCallCount++;
+                };
                 gui.ProjectOpened += project =>
                 {
-                    Assert.AreSame(newProjectMock, project);
+                    Assert.AreSame(newProject, project);
                     openedCallCount++;
                 };
 
                 // Call
-                gui.SetProject(newProjectMock, null);
+                gui.SetProject(newProject, null);
 
                 // Assert
                 Assert.AreEqual(1, openedCallCount);
+                Assert.AreEqual(1, beforeOpenCallCount);
             }
             mocks.VerifyAll();
         }