gtk_drag_dest_set(notebook, 0, NULL, 0, 0);
gtk_box_pack_start(GTK_BOX(vbox), notebook, TRUE, TRUE, 6);
gtk_widget_get_allocation(page, &allocation);
gtk_drag_dest_set(notebook, 0, NULL, 0, 0);
gtk_box_pack_start(GTK_BOX(vbox), notebook, TRUE, TRUE, 6);
gtk_widget_get_allocation(page, &allocation);