diff --git a/lib/matplotlib/backends/backend_gtk3.py b/lib/matplotlib/backends/backend_gtk3.py
index 2c4099a50e0..63f19deb68a 100644
--- a/lib/matplotlib/backends/backend_gtk3.py
+++ b/lib/matplotlib/backends/backend_gtk3.py
@@ -935,166 +935,6 @@ def trigger(self, sender, event, data=None):
         self.window.present()
 
 
-class DialogLineprops(object):
-    """
-    A GUI dialog for controlling lineprops
-    """
-    signals = (
-        'on_combobox_lineprops_changed',
-        'on_combobox_linestyle_changed',
-        'on_combobox_marker_changed',
-        'on_colorbutton_linestyle_color_set',
-        'on_colorbutton_markerface_color_set',
-        'on_dialog_lineprops_okbutton_clicked',
-        'on_dialog_lineprops_cancelbutton_clicked',
-        )
-
-    linestyles = [ls for ls in lines.Line2D.lineStyles if ls.strip()]
-    linestyled = dict([ (s,i) for i,s in enumerate(linestyles)])
-
-
-    markers =  [m for m in lines.Line2D.markers if cbook.is_string_like(m)]
-
-    markerd = dict([(s,i) for i,s in enumerate(markers)])
-
-    def __init__(self, lines):
-        import Gtk.glade
-
-        datadir = matplotlib.get_data_path()
-        gladefile = os.path.join(datadir, 'lineprops.glade')
-        if not os.path.exists(gladefile):
-            raise IOError('Could not find gladefile lineprops.glade in %s'%datadir)
-
-        self._inited = False
-        self._updateson = True # suppress updates when setting widgets manually
-        self.wtree = Gtk.glade.XML(gladefile, 'dialog_lineprops')
-        self.wtree.signal_autoconnect(dict([(s, getattr(self, s)) for s in self.signals]))
-
-        self.dlg = self.wtree.get_widget('dialog_lineprops')
-
-        self.lines = lines
-
-        cbox = self.wtree.get_widget('combobox_lineprops')
-        cbox.set_active(0)
-        self.cbox_lineprops = cbox
-
-        cbox = self.wtree.get_widget('combobox_linestyles')
-        for ls in self.linestyles:
-            cbox.append_text(ls)
-        cbox.set_active(0)
-        self.cbox_linestyles = cbox
-
-        cbox = self.wtree.get_widget('combobox_markers')
-        for m in self.markers:
-            cbox.append_text(m)
-        cbox.set_active(0)
-        self.cbox_markers = cbox
-        self._lastcnt = 0
-        self._inited = True
-
-
-    def show(self):
-        'populate the combo box'
-        self._updateson = False
-        # flush the old
-        cbox = self.cbox_lineprops
-        for i in range(self._lastcnt-1,-1,-1):
-            cbox.remove_text(i)
-
-        # add the new
-        for line in self.lines:
-            cbox.append_text(line.get_label())
-        cbox.set_active(0)
-
-        self._updateson = True
-        self._lastcnt = len(self.lines)
-        self.dlg.show()
-
-    def get_active_line(self):
-        'get the active line'
-        ind = self.cbox_lineprops.get_active()
-        line = self.lines[ind]
-        return line
-
-    def get_active_linestyle(self):
-        'get the active lineinestyle'
-        ind = self.cbox_linestyles.get_active()
-        ls = self.linestyles[ind]
-        return ls
-
-    def get_active_marker(self):
-        'get the active lineinestyle'
-        ind = self.cbox_markers.get_active()
-        m = self.markers[ind]
-        return m
-
-    def _update(self):
-        'update the active line props from the widgets'
-        if not self._inited or not self._updateson: return
-        line = self.get_active_line()
-        ls = self.get_active_linestyle()
-        marker = self.get_active_marker()
-        line.set_linestyle(ls)
-        line.set_marker(marker)
-
-        button = self.wtree.get_widget('colorbutton_linestyle')
-        color = button.get_color()
-        r, g, b = [val/65535. for val in (color.red, color.green, color.blue)]
-        line.set_color((r,g,b))
-
-        button = self.wtree.get_widget('colorbutton_markerface')
-        color = button.get_color()
-        r, g, b = [val/65535. for val in (color.red, color.green, color.blue)]
-        line.set_markerfacecolor((r,g,b))
-
-        line.figure.canvas.draw()
-
-    def on_combobox_lineprops_changed(self, item):
-        'update the widgets from the active line'
-        if not self._inited: return
-        self._updateson = False
-        line = self.get_active_line()
-
-        ls = line.get_linestyle()
-        if ls is None: ls = 'None'
-        self.cbox_linestyles.set_active(self.linestyled[ls])
-
-        marker = line.get_marker()
-        if marker is None: marker = 'None'
-        self.cbox_markers.set_active(self.markerd[marker])
-
-        r,g,b = colorConverter.to_rgb(line.get_color())
-        color = Gdk.Color(*[int(val*65535) for val in (r,g,b)])
-        button = self.wtree.get_widget('colorbutton_linestyle')
-        button.set_color(color)
-
-        r,g,b = colorConverter.to_rgb(line.get_markerfacecolor())
-        color = Gdk.Color(*[int(val*65535) for val in (r,g,b)])
-        button = self.wtree.get_widget('colorbutton_markerface')
-        button.set_color(color)
-        self._updateson = True
-
-    def on_combobox_linestyle_changed(self, item):
-        self._update()
-
-    def on_combobox_marker_changed(self, item):
-        self._update()
-
-    def on_colorbutton_linestyle_color_set(self, button):
-        self._update()
-
-    def on_colorbutton_markerface_color_set(self, button):
-        'called colorbutton marker clicked'
-        self._update()
-
-    def on_dialog_lineprops_okbutton_clicked(self, button):
-        self._update()
-        self.dlg.hide()
-
-    def on_dialog_lineprops_cancelbutton_clicked(self, button):
-        self.dlg.hide()
-
-
 # Define the file to use as the GTk icon
 if sys.platform == 'win32':
     icon_filename = 'matplotlib.png'