gtk_notebook_set_group(GTK_NOTEBOOK(notebook), GRP_ID);
g_signal_connect(notebook, "create-window", G_CALLBACK(create_new_notebook_window), NULL);
gtk_drag_dest_set(notebook, GTK_DEST_DEFAULT_ALL, ¬ebook_target, 1, GDK_ACTION_MOVE);
gtk_notebook_set_group(GTK_NOTEBOOK(notebook), GRP_ID);
g_signal_connect(notebook, "create-window", G_CALLBACK(create_new_notebook_window), NULL);
gtk_drag_dest_set(notebook, GTK_DEST_DEFAULT_ALL, ¬ebook_target, 1, GDK_ACTION_MOVE);