diff --git a/README.md b/README.md
index 437ed58..1078ee1 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ The project currently consists of:
 Current limitations:
 * Audio is not yet supported
 * Nested timelines are not yet supported
-* Outputting movie files currently relies on the FFmpeg command line program
+* Exporting movie files currently relies on the FFmpeg command line program
 (see below: FFmpeg Encoding)
 
 Toucan relies on the following libraries:
@@ -93,7 +93,7 @@ Multiple effects on clips, tracks, and stacks:
 
 FFmpeg Encoding
 ===============
-Toucan can output rendered images directly to FFmpeg for encoding. The
+Toucan can send rendered images directly to FFmpeg for encoding. The
 images are piped to FFmpeg without incurring the overhead of disk I/O.
 
 Example command line for piping images to FFmpeg:
diff --git a/bin/toucan-view/main.cpp b/bin/toucan-view/main.cpp
index f537514..18c0dc1 100644
--- a/bin/toucan-view/main.cpp
+++ b/bin/toucan-view/main.cpp
@@ -3,6 +3,10 @@
 
 #include "toucanView/App.h"
 
+#include <dtk/core/Context.h>
+
+#include <iostream>
+
 DTK_MAIN()
 {
     try
diff --git a/lib/toucanView/App.cpp b/lib/toucanView/App.cpp
index 415f085..8ba79b4 100644
--- a/lib/toucanView/App.cpp
+++ b/lib/toucanView/App.cpp
@@ -3,6 +3,11 @@
 
 #include "App.h"
 
+#include "DocumentsModel.h"
+#include "MainWindow.h"
+#include "TimeUnitsModel.h"
+#include "WindowModel.h"
+
 #include <dtk/ui/DialogSystem.h>
 #include <dtk/ui/FileBrowser.h>
 #include <dtk/ui/MessageDialog.h>
@@ -50,7 +55,7 @@ namespace toucan
 
         _windowModel = std::make_shared<WindowModel>();
 
-        _window = Window::create(
+        _window = MainWindow::create(
             context,
             std::dynamic_pointer_cast<App>(shared_from_this()),
             "toucan-view",
diff --git a/lib/toucanView/App.h b/lib/toucanView/App.h
index 0379344..3899e1b 100644
--- a/lib/toucanView/App.h
+++ b/lib/toucanView/App.h
@@ -3,15 +3,17 @@
 
 #pragma once
 
-#include "DocumentsModel.h"
-#include "TimeUnitsModel.h"
-#include "Window.h"
-#include "WindowModel.h"
-
 #include <dtk/ui/App.h>
 
 namespace toucan
 {
+    class DocumentsModel;
+    class ImageEffectHost;
+    class MainWindow;
+    class MessageLog;
+    class TimeUnitsModel;
+    class WindowModel;
+
     class App : public dtk::App
     {
     protected:
@@ -38,7 +40,7 @@ namespace toucan
         std::shared_ptr<ImageEffectHost> _host;
         std::shared_ptr<DocumentsModel> _documentsModel;
         std::shared_ptr<WindowModel> _windowModel;
-        std::shared_ptr<Window> _window;
+        std::shared_ptr<MainWindow> _window;
     };
 }
 
diff --git a/lib/toucanView/CMakeLists.txt b/lib/toucanView/CMakeLists.txt
index e1512d9..3102aa0 100644
--- a/lib/toucanView/CMakeLists.txt
+++ b/lib/toucanView/CMakeLists.txt
@@ -11,6 +11,7 @@ set(HEADERS
     IItem.h
     IToolWidget.h
     JSONTool.h
+    MainWindow.h
     MenuBar.h
     PlaybackBar.h
     PlaybackModel.h
@@ -25,7 +26,6 @@ set(HEADERS
     TrackItem.h
     ViewModel.h
     Viewport.h
-    Window.h
     WindowModel.h)
 
 set(SOURCE
@@ -41,6 +41,7 @@ set(SOURCE
     IItem.cpp
     IToolWidget.cpp
     JSONTool.cpp
+    MainWindow.cpp
     MenuBar.cpp
     PlaybackBar.cpp
     PlaybackModel.cpp
@@ -55,7 +56,6 @@ set(SOURCE
     TrackItem.cpp
     ViewModel.cpp
     Viewport.cpp
-    Window.cpp
     WindowModel.cpp)
 
 add_library(toucanView ${HEADERS} ${SOURCE})
diff --git a/lib/toucanView/DocumentTab.h b/lib/toucanView/DocumentTab.h
index 1180525..7dd96ee 100644
--- a/lib/toucanView/DocumentTab.h
+++ b/lib/toucanView/DocumentTab.h
@@ -3,8 +3,6 @@
 
 #pragma once
 
-#include "WindowModel.h"
-
 #include <dtk/ui/RowLayout.h>
 
 namespace toucan
diff --git a/lib/toucanView/DocumentsModel.cpp b/lib/toucanView/DocumentsModel.cpp
index c68230f..0dae5d2 100644
--- a/lib/toucanView/DocumentsModel.cpp
+++ b/lib/toucanView/DocumentsModel.cpp
@@ -5,6 +5,8 @@
 
 #include "PlaybackModel.h"
 
+#include <toucan/ImageEffectHost.h>
+
 #include <dtk/core/Math.h>
 
 namespace toucan
diff --git a/lib/toucanView/DocumentsModel.h b/lib/toucanView/DocumentsModel.h
index 7883cb0..f072042 100644
--- a/lib/toucanView/DocumentsModel.h
+++ b/lib/toucanView/DocumentsModel.h
@@ -5,14 +5,15 @@
 
 #include "Document.h"
 
-#include <toucan/ImageEffectHost.h>
-
 #include <dtk/core/Context.h>
 #include <dtk/core/ObservableList.h>
 #include <dtk/core/ObservableValue.h>
 
 namespace toucan
 {
+    class Document;
+    class ImageEffectHost;
+
     class DocumentsModel : public std::enable_shared_from_this<DocumentsModel>
     {
     public:
diff --git a/lib/toucanView/GraphTool.cpp b/lib/toucanView/GraphTool.cpp
index 6a4ae1b..d25ee45 100644
--- a/lib/toucanView/GraphTool.cpp
+++ b/lib/toucanView/GraphTool.cpp
@@ -4,7 +4,7 @@
 #include "GraphTool.h"
 
 #include "App.h"
-#include "Document.h"
+#include "DocumentsModel.h"
 
 #include <dtk/ui/Spacer.h>
 
diff --git a/lib/toucanView/JSONTool.cpp b/lib/toucanView/JSONTool.cpp
index 5883504..aac6e6c 100644
--- a/lib/toucanView/JSONTool.cpp
+++ b/lib/toucanView/JSONTool.cpp
@@ -4,6 +4,8 @@
 #include "JSONTool.h"
 
 #include "App.h"
+#include "DocumentsModel.h"
+#include "SelectionModel.h"
 
 #include <dtk/ui/Divider.h>
 #include <dtk/ui/Label.h>
diff --git a/lib/toucanView/JSONTool.h b/lib/toucanView/JSONTool.h
index ec56e6e..c7bb08b 100644
--- a/lib/toucanView/JSONTool.h
+++ b/lib/toucanView/JSONTool.h
@@ -4,11 +4,13 @@
 #pragma once
 
 #include "IToolWidget.h"
-#include "SelectionModel.h"
 
 #include <dtk/ui/Bellows.h>
 #include <dtk/ui/RowLayout.h>
 #include <dtk/ui/ScrollWidget.h>
+#include <dtk/core/ObservableList.h>
+
+#include <opentimelineio/item.h>
 
 namespace toucan
 {
diff --git a/lib/toucanView/Window.cpp b/lib/toucanView/MainWindow.cpp
similarity index 86%
rename from lib/toucanView/Window.cpp
rename to lib/toucanView/MainWindow.cpp
index 6ab13ff..8b6957e 100644
--- a/lib/toucanView/Window.cpp
+++ b/lib/toucanView/MainWindow.cpp
@@ -1,10 +1,11 @@
 // SPDX-License-Identifier: Apache-2.0
 // Copyright Contributors to the toucan project.
 
-#include "Window.h"
+#include "MainWindow.h"
 
 #include "App.h"
 #include "DocumentTab.h"
+#include "DocumentsModel.h"
 #include "ExportTool.h"
 #include "GraphTool.h"
 #include "JSONTool.h"
@@ -19,7 +20,7 @@
 
 namespace toucan
 {
-    void Window::_init(
+    void MainWindow::_init(
         const std::shared_ptr<dtk::Context>& context,
         const std::shared_ptr<App>& app,
         const std::string& name,
@@ -35,19 +36,18 @@ namespace toucan
         _menuBar = MenuBar::create(
             context,
             app,
-            std::dynamic_pointer_cast<Window>(shared_from_this()),
+            std::dynamic_pointer_cast<MainWindow>(shared_from_this()),
             _layout);
         dtk::Divider::create(context, dtk::Orientation::Vertical, _layout);
 
         _toolBar = ToolBar::create(
             context,
             app,
-            std::dynamic_pointer_cast<Window>(shared_from_this()),
+            std::dynamic_pointer_cast<MainWindow>(shared_from_this()),
             _menuBar->getActions(),
             _layout);
         _toolBarDivider = dtk::Divider::create(context, dtk::Orientation::Vertical, _layout);
 
-
         _vSplitter = dtk::Splitter::create(context, dtk::Orientation::Vertical, _layout);
         _vSplitter->setSplit({ .7F, .3F });
         _vSplitter->setStretch(dtk::Stretch::Expanding);
@@ -69,7 +69,11 @@ namespace toucan
 
         _bottomLayout = dtk::VerticalLayout::create(context, _vSplitter);
         _bottomLayout->setSpacingRole(dtk::SizeRole::None);
+
         _playbackBar = PlaybackBar::create(context, app, _bottomLayout);
+
+        _bottomDivider = dtk::Divider::create(context, dtk::Orientation::Vertical, _bottomLayout);
+
         _timelineWidget = TimelineWidget::create(context, app, _bottomLayout);
         _timelineWidget->setVStretch(dtk::Stretch::Expanding);
 
@@ -146,11 +150,14 @@ namespace toucan
                 auto i = value.find(WindowControl::ToolBar);
                 _toolBar->setVisible(i->second);
                 _toolBarDivider->setVisible(i->second);
-                i = value.find(WindowControl::TimelineWidget);
-                _timelineWidget->setVisible(i->second);
-                auto j = value.find(WindowControl::PlaybackBar);
-                _playbackBar->setVisible(j->second);
+
+                i = value.find(WindowControl::PlaybackBar);
+                _playbackBar->setVisible(i->second);
+                auto j = value.find(WindowControl::TimelineWidget);
+                _timelineWidget->setVisible(j->second);
                 _bottomLayout->setVisible(i->second || j->second);
+                _bottomDivider->setVisible(i->second && j->second);
+
                 i = value.find(WindowControl::Tools);
                 _toolWidget->setVisible(i->second);
             });
@@ -163,43 +170,43 @@ namespace toucan
             });
     }
 
-    Window::~Window()
+    MainWindow::~MainWindow()
     {}
 
-    std::shared_ptr<Window> Window::create(
+    std::shared_ptr<MainWindow> MainWindow::create(
         const std::shared_ptr<dtk::Context>& context,
         const std::shared_ptr<App>& app,
         const std::string& name,
         const dtk::Size2I& size)
     {
-        auto out = std::shared_ptr<Window>(new Window);
+        auto out = std::shared_ptr<MainWindow>(new MainWindow);
         out->_init(context, app, name, size);
         return out;
     }
 
-    void Window::setGeometry(const dtk::Box2I& value)
+    void MainWindow::setGeometry(const dtk::Box2I& value)
     {
         dtk::Window::setGeometry(value);
         _layout->setGeometry(value);
     }
 
-    void Window::sizeHintEvent(const dtk::SizeHintEvent& event)
+    void MainWindow::sizeHintEvent(const dtk::SizeHintEvent& event)
     {
         dtk::Window::sizeHintEvent(event);
         _setSizeHint(_layout->getSizeHint());
     }
 
-    void Window::keyPressEvent(dtk::KeyEvent& event)
+    void MainWindow::keyPressEvent(dtk::KeyEvent& event)
     {
         event.accept = _menuBar->shortcut(event.key, event.modifiers);
     }
 
-    void Window::keyReleaseEvent(dtk::KeyEvent& event)
+    void MainWindow::keyReleaseEvent(dtk::KeyEvent& event)
     {
         event.accept = true;
     }
 
-    void Window::_drop(const std::vector<std::string>& value)
+    void MainWindow::_drop(const std::vector<std::string>& value)
     {
         if (auto context = getContext())
         {
diff --git a/lib/toucanView/Window.h b/lib/toucanView/MainWindow.h
similarity index 93%
rename from lib/toucanView/Window.h
rename to lib/toucanView/MainWindow.h
index e4a1595..44e12e9 100644
--- a/lib/toucanView/Window.h
+++ b/lib/toucanView/MainWindow.h
@@ -23,7 +23,7 @@ namespace toucan
     class TimelineWidget;
     class ToolBar;
 
-    class Window : public dtk::Window
+    class MainWindow : public dtk::Window
     {
     protected:
         void _init(
@@ -33,9 +33,9 @@ namespace toucan
             const dtk::Size2I&);
 
     public:
-        virtual ~Window();
+        virtual ~MainWindow();
 
-        static std::shared_ptr<Window> create(
+        static std::shared_ptr<MainWindow> create(
             const std::shared_ptr<dtk::Context>&,
             const std::shared_ptr<App>&,
             const std::string& name,
@@ -65,6 +65,7 @@ namespace toucan
         std::vector<std::shared_ptr<IToolWidget> > _toolWidgets;
         std::shared_ptr<dtk::VerticalLayout> _bottomLayout;
         std::shared_ptr<PlaybackBar> _playbackBar;
+        std::shared_ptr<dtk::Divider> _bottomDivider;
         std::shared_ptr<TimelineWidget> _timelineWidget;
 
         std::shared_ptr<dtk::ListObserver<std::shared_ptr<Document> > > _documentsObserver;
diff --git a/lib/toucanView/MenuBar.cpp b/lib/toucanView/MenuBar.cpp
index 5d0b4b8..411e0a9 100644
--- a/lib/toucanView/MenuBar.cpp
+++ b/lib/toucanView/MenuBar.cpp
@@ -4,6 +4,8 @@
 #include "MenuBar.h"
 
 #include "App.h"
+#include "DocumentsModel.h"
+#include "MainWindow.h"
 #include "SelectionModel.h"
 #include "ViewModel.h"
 
@@ -18,7 +20,7 @@ namespace toucan
     void MenuBar::_init(
         const std::shared_ptr<dtk::Context>& context,
         const std::shared_ptr<App>& app,
-        const std::shared_ptr<Window>& window,
+        const std::shared_ptr<MainWindow>& window,
         const std::shared_ptr<dtk::IWidget>& parent)
     {
         dtk::MenuBar::_init(context, parent);
@@ -82,7 +84,7 @@ namespace toucan
     std::shared_ptr<MenuBar> MenuBar::create(
         const std::shared_ptr<dtk::Context>& context,
         const std::shared_ptr<App>& app,
-        const std::shared_ptr<Window>& window,
+        const std::shared_ptr<MainWindow>& window,
         const std::shared_ptr<dtk::IWidget>& parent)
     {
         auto out = std::shared_ptr<MenuBar>(new MenuBar);
@@ -183,16 +185,6 @@ namespace toucan
 
         _menus["File"]->addDivider();
 
-        _actions["File/Export"] = std::make_shared<dtk::Action>(
-            "Export",
-            dtk::Key::T,
-            static_cast<int>(dtk::KeyModifier::Control),
-            [this] {
-            });
-        _menus["File"]->addItem(_actions["File/Export"]);
-
-        _menus["File"]->addDivider();
-
         _actions["File/Exit"] = std::make_shared<dtk::Action>(
             "Exit",
             dtk::Key::Q,
@@ -433,12 +425,12 @@ namespace toucan
     void MenuBar::_windowMenuInit(
         const std::shared_ptr<dtk::Context>& context,
         const std::shared_ptr<App>& app,
-        const std::shared_ptr<Window>& window)
+        const std::shared_ptr<MainWindow>& window)
     {
         _menus["Window"] = dtk::Menu::create(context);
         addMenu("Window", _menus["Window"]);
 
-        std::weak_ptr<Window> windowWeak(window);
+        std::weak_ptr<MainWindow> windowWeak(window);
         _actions["Window/FullScreen"] = std::make_shared<dtk::Action>(
             "Full Screen",
             "WindowFullScreen",
diff --git a/lib/toucanView/MenuBar.h b/lib/toucanView/MenuBar.h
index 56ca6f7..0e5062c 100644
--- a/lib/toucanView/MenuBar.h
+++ b/lib/toucanView/MenuBar.h
@@ -4,18 +4,19 @@
 #pragma once
 
 #include "PlaybackModel.h"
-#include "WindowModel.h"
 #include "TimeUnitsModel.h"
+#include "WindowModel.h"
 
 #include <dtk/ui/MenuBar.h>
 #include <dtk/core/ObservableList.h>
+#include <dtk/core/ObservableMap.h>
 
 namespace toucan
 {
     class App;
     class Document;
     class DocumentsModel;
-    class Window;
+    class MainWindow;
 
     class MenuBar : public dtk::MenuBar
     {
@@ -23,7 +24,7 @@ namespace toucan
         void _init(
             const std::shared_ptr<dtk::Context>&,
             const std::shared_ptr<App>&,
-            const std::shared_ptr<Window>&,
+            const std::shared_ptr<MainWindow>&,
             const std::shared_ptr<IWidget>& parent);
 
     public:
@@ -32,7 +33,7 @@ namespace toucan
         static std::shared_ptr<MenuBar> create(
             const std::shared_ptr<dtk::Context>&,
             const std::shared_ptr<App>&,
-            const std::shared_ptr<Window>&,
+            const std::shared_ptr<MainWindow>&,
             const std::shared_ptr<IWidget>& parent = nullptr);
 
         const std::map<std::string, std::shared_ptr<dtk::Action> >& getActions() const;
@@ -53,7 +54,7 @@ namespace toucan
         void _windowMenuInit(
             const std::shared_ptr<dtk::Context>&,
             const std::shared_ptr<App>&,
-            const std::shared_ptr<Window>&);
+            const std::shared_ptr<MainWindow>&);
         void _viewMenuInit(
             const std::shared_ptr<dtk::Context>&,
             const std::shared_ptr<App>&);
diff --git a/lib/toucanView/PlaybackBar.cpp b/lib/toucanView/PlaybackBar.cpp
index 19662cc..57939e8 100644
--- a/lib/toucanView/PlaybackBar.cpp
+++ b/lib/toucanView/PlaybackBar.cpp
@@ -4,6 +4,7 @@
 #include "PlaybackBar.h"
 
 #include "App.h"
+#include "DocumentsModel.h"
 
 namespace toucan
 {
diff --git a/lib/toucanView/TimelineItem.cpp b/lib/toucanView/TimelineItem.cpp
index 9174d25..13b99d4 100644
--- a/lib/toucanView/TimelineItem.cpp
+++ b/lib/toucanView/TimelineItem.cpp
@@ -5,6 +5,7 @@
 
 #include "App.h"
 #include "DocumentsModel.h"
+#include "SelectionModel.h"
 #include "StackItem.h"
 
 #include <dtk/ui/ScrollArea.h>
diff --git a/lib/toucanView/TimelineItem.h b/lib/toucanView/TimelineItem.h
index c6f3b60..e74f1ec 100644
--- a/lib/toucanView/TimelineItem.h
+++ b/lib/toucanView/TimelineItem.h
@@ -4,15 +4,16 @@
 #pragma once
 
 #include "IItem.h"
-#include "SelectionModel.h"
 #include "ThumbnailGenerator.h"
 #include "TimeUnitsModel.h"
 
 #include <dtk/core/LRUCache.h>
+#include <dtk/core/ObservableList.h>
 
 namespace toucan
 {
     class Document;
+    class SelectionModel;
 
     class TimelineItem : public IItem
     {
diff --git a/lib/toucanView/ToolBar.cpp b/lib/toucanView/ToolBar.cpp
index 26bea6f..29f7c22 100644
--- a/lib/toucanView/ToolBar.cpp
+++ b/lib/toucanView/ToolBar.cpp
@@ -4,6 +4,8 @@
 #include "ToolBar.h"
 
 #include "App.h"
+#include "DocumentsModel.h"
+#include "MainWindow.h"
 #include "ViewModel.h"
 
 #include <dtk/ui/Divider.h>
@@ -13,7 +15,7 @@ namespace toucan
     void ToolBar::_init(
         const std::shared_ptr<dtk::Context>& context,
         const std::shared_ptr<App>& app,
-        const std::shared_ptr<Window>& window,
+        const std::shared_ptr<MainWindow>& window,
         const std::map<std::string, std::shared_ptr<dtk::Action> >& actions,
         const std::shared_ptr<dtk::IWidget>& parent)
     {
@@ -136,7 +138,7 @@ namespace toucan
     std::shared_ptr<ToolBar> ToolBar::create(
         const std::shared_ptr<dtk::Context>& context,
         const std::shared_ptr<App>& app,
-        const std::shared_ptr<Window>& window,
+        const std::shared_ptr<MainWindow>& window,
         const std::map<std::string, std::shared_ptr<dtk::Action> >& actions,
         const std::shared_ptr<dtk::IWidget>& parent)
     {
diff --git a/lib/toucanView/ToolBar.h b/lib/toucanView/ToolBar.h
index 6dc6cff..4bc15bc 100644
--- a/lib/toucanView/ToolBar.h
+++ b/lib/toucanView/ToolBar.h
@@ -13,7 +13,7 @@ namespace toucan
 {
     class App;
     class Document;
-    class Window;
+    class MainWindow;
 
     class ToolBar : public dtk::IWidget
     {
@@ -21,7 +21,7 @@ namespace toucan
         void _init(
             const std::shared_ptr<dtk::Context>&,
             const std::shared_ptr<App>&,
-            const std::shared_ptr<Window>&,
+            const std::shared_ptr<MainWindow>&,
             const std::map<std::string, std::shared_ptr<dtk::Action> >&,
             const std::shared_ptr<IWidget>& parent);
 
@@ -31,7 +31,7 @@ namespace toucan
         static std::shared_ptr<ToolBar> create(
             const std::shared_ptr<dtk::Context>&,
             const std::shared_ptr<App>&,
-            const std::shared_ptr<Window>&,
+            const std::shared_ptr<MainWindow>&,
             const std::map<std::string, std::shared_ptr<dtk::Action> >&,
             const std::shared_ptr<IWidget>& parent = nullptr);