window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), _("Source of the message"));
+ gtk_window_set_wmclass(GTK_WINDOW(window), "source_window", "Sylpheed");
gtk_window_set_policy(GTK_WINDOW(window), TRUE, TRUE, FALSE);
gtk_widget_set_usize(window, 600, 500);
gtk_signal_connect(GTK_OBJECT(window), "destroy",