treeview how to make search function

[Chris De Maeyer <chrisdm pandora be>]

How do i implement the treeview searchable functionality?

Currently i have following code, but doesn't work:

store = gtk_tree_store_new (N_COLUMNS,G_TYPE_STRING,G_TYPE_STRING);
        FillAirports(store);
        tree = gtk_tree_view_new_with_model (GTK_TREE_MODEL (store));
        g_object_unref (G_OBJECT (store));
        
        renderer = gtk_cell_renderer_text_new ();
        column = gtk_tree_view_column_new_with_attributes ("Location",
renderer, "text", NAME_COLUMN,NULL);
        gtk_tree_view_append_column (GTK_TREE_VIEW (tree), column);
        column = gtk_tree_view_column_new_with_attributes ("ID", renderer,
"text", ID_COLUMN,NULL);
        gtk_tree_view_append_column (GTK_TREE_VIEW (tree), column);
        
        gtk_tree_view_set_enable_search(GTK_TREE_VIEW (tree),TRUE); 
        gtk_tree_view_set_search_column(GTK_TREE_VIEW (tree),0);
        
        scrolled_window = gtk_scrolled_window_new (NULL, NULL);
        gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_window),
GTK_POLICY_AUTOMATIC, GTK_POLICY_ALWAYS);
        gtk_box_pack_start(GTK_BOX(hboxa0), scrolled_window, TRUE, TRUE, 0);