@@ -1311,6 +1311,8 @@ class DotWidget(gtk.DrawingArea):

         self.filter = filter

     def set_dotcode(self, dotcode, filename='<stdin>'):

+        if isinstance(dotcode, unicode):

+            dotcode = dotcode.encode('utf8')

         p = subprocess.Popen(

             [self.filter, '-Txdot'],

             stdin=subprocess.PIPE,