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diff --git a/Bustle/Gtk.hs b/Bustle/Gtk.hs
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+{-
+Bustle.Gtk: Stuff missing from the Gtk binding
+Copyright © 2015 Will Thompson
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+-}
+{-# LANGUAGE ForeignFunctionInterface #-}
+module Bustle.Gtk
+  ( b_windowSetTitlebar
+  , b_headerBarSetSubtitle
+  )
+where
+
+import Foreign.Ptr
+import Foreign.ForeignPtr
+
+import qualified System.Glib.GObject as GO
+import System.Glib.Properties (objectSetPropertyMaybeString)
+import Graphics.UI.Gtk
+
+
+foreign import ccall "gtk_window_set_titlebar"
+    gtk_window_set_titlebar :: Ptr GObject
+                    -> Ptr GObject
+                    -> IO ()
+
+
+b_windowSetTitlebar :: (WindowClass window,
+                        WidgetClass widget)
+                    => window
+                    -> widget
+                    -> IO ()
+b_windowSetTitlebar window titlebar =
+    withForeignPtr (GO.unGObject (GO.toGObject window)) $ \pWindow ->
+    withForeignPtr (GO.unGObject (GO.toGObject titlebar)) $ \pTitlebar ->
+    gtk_window_set_titlebar pWindow pTitlebar
+
+b_headerBarSetSubtitle :: WidgetClass headerBar -- BZZT
+                       => headerBar
+                       -> Maybe String
+                       -> IO ()
+b_headerBarSetSubtitle = objectSetPropertyMaybeString "subtitle"