gtk_tree_store_append (store, &iter, NULL);
gtk_tree_store_set (store, &iter,NAME_COLUMN,trace_str,-1);
path = gtk_tree_model_get_path(GTK_TREE_MODEL(store), &iter);
gtk_tree_store_append (store, &iter, NULL);
gtk_tree_store_set (store, &iter,NAME_COLUMN,trace_str,-1);
path = gtk_tree_model_get_path(GTK_TREE_MODEL(store), &iter);