diff --git a/tests/gtk/test_window.py b/tests/gtk/test_window.py
index 1be4dc5..f5fd522 100644
--- a/tests/gtk/test_window.py
+++ b/tests/gtk/test_window.py
@@ -43,9 +43,33 @@ class TestWindow(unittest.TestCase):
         self.assertIsInstance(self.window._splitview, Adw.OverlaySplitView)
         self.assertEqual(self.window.headerbar.get_next_sibling(),
                          self.window._splitview)
-        self.assertFalse(self.window._splitview.props.show_sidebar)
         self.assertTrue(self.window._splitview.props.collapsed)
 
+    def test_show_sidebar(self):
+        """Test the window show sidebar button."""
+        self.assertIsInstance(self.window._show_sidebar, Gtk.ToggleButton)
+        self.assertEqual(self.window._show_sidebar.get_ancestor(Adw.HeaderBar),
+                         self.window.headerbar)
+        self.assertEqual(self.window._show_sidebar.props.icon_name,
+                         "sidebar-show")
+
+        self.assertFalse(self.window.show_sidebar)
+        self.assertFalse(self.window._show_sidebar.props.active)
+        self.assertFalse(self.window._splitview.props.show_sidebar)
+
+        self.window._show_sidebar.props.active = True
+        self.assertTrue(self.window._splitview.props.show_sidebar)
+        self.assertTrue(self.window.show_sidebar)
+
+        self.window.show_sidebar = False
+        self.assertFalse(self.window._show_sidebar.props.active)
+        self.assertFalse(self.window._splitview.props.show_sidebar)
+
+        window2 = xfstestsdb.gtk.window.Window(show_sidebar=True)
+        self.assertTrue(window2.show_sidebar)
+        self.assertTrue(window2._show_sidebar.props.active)
+        self.assertTrue(window2._splitview.props.show_sidebar)
+
     def test_content(self):
         """Test the window content property."""
         self.assertIsNone(self.window.child)
diff --git a/xfstestsdb/gtk/window.py b/xfstestsdb/gtk/window.py
index c6520ed..9830f2e 100644
--- a/xfstestsdb/gtk/window.py
+++ b/xfstestsdb/gtk/window.py
@@ -13,6 +13,7 @@ class Window(Adw.Window):
     headerbar = GObject.Property(type=Adw.HeaderBar)
     title = GObject.Property(type=Adw.WindowTitle)
     runid = GObject.Property(type=int)
+    show_sidebar = GObject.Property(type=bool, default=False)
 
     def __init__(self, **kwargs):
         """Set up our Window."""
@@ -22,15 +23,22 @@ class Window(Adw.Window):
                          headerbar=Adw.HeaderBar(), **kwargs)
         self._splitview = Adw.OverlaySplitView(content=self.child,
                                                collapsed=True,
-                                               show_sidebar=False)
+                                               show_sidebar=self.show_sidebar)
+        self._show_sidebar = Gtk.ToggleButton(icon_name="sidebar-show",
+                                              active=self.show_sidebar)
 
+        self.headerbar.pack_start(self._show_sidebar)
         self.headerbar.props.title_widget = self.title
         self.headerbar.add_css_class("flat")
 
         self.props.content.append(self.headerbar)
         self.props.content.append(self._splitview)
 
+        self._show_sidebar.bind_property("active", self, "show-sidebar",
+                                         GObject.BindingFlags.BIDIRECTIONAL)
+        self.bind_property("show-sidebar", self._splitview, "show-sidebar")
         self.bind_property("child", self._splitview, "content")
+
         self.connect("notify::runid", self.__notify_runid)
 
         if __debug__: