GTKSocket, widget, and glade

Question

I have the following code:

    builder = gtk.Builder()
    builder.add_from_file(glade_file)
    builder.get_object("windowMain").show()
    socket = gtk.Socket()
    socket.add_id(long(OpenGLWindowID))
    builder.get_object('alignment1').add(socket)

where alignment1 is a GtkAlignment widget. But when I run this, I get:

fubar.py:64: GtkWarning: IA__gtk_socket_add_id: assertion `GTK_WIDGET_ANCHORED (socket)' failed
  socket.add_id(long(self.OpenGLWindowID))

Does anyone know which widget I should use Gtk.Socket() with when building the glade file? Have I mis-understood something vital?

Answer 1

I think you need to add the socket to the alignment before you call the add_id() method.