@@ -1537,7 +1537,8 @@ class DotWidget(Gtk.DrawingArea):

     #TODO GTK3: Second argument has to be of type Gdk.EventButton instead of object.

     __gsignals__ = {

-        'clicked' : (GObject.SIGNAL_RUN_LAST, None, (str, object))

+        'clicked' : (GObject.SIGNAL_RUN_LAST, None, (str, object)),

+        'error' : (GObject.SIGNAL_RUN_LAST, None, (str,))

     }

     filter = 'dot'

@@ -1575,6 +1576,9 @@ class DotWidget(Gtk.DrawingArea):

         self.presstime = None

         self.highlight = None

+    def error_dialog(self, message):

+        self.emit('error', message)

+

     def set_filter(self, filter):

         self.filter = filter

@@ -1973,6 +1977,7 @@ class DotWindow(Gtk.Window):

         window.add(vbox)

         self.dotwidget = widget or DotWidget()

+        self.dotwidget.connect("error", lambda e, m: self.error_dialog(m))

         # Create a UIManager instance

         uimanager = self.uimanager = Gtk.UIManager()