Gtk tree view filter

[ignas...@terra.es]

Hola,
estoy intentando hacer mi primer programa en Gtk. Es muy sencillo: la idea es 
presentar una lista en la ventana izquierda y un tree-view en la derecha, de 
tal manera que al seleccionar un elemento en la lista se muestre en el 
tree-view las filas que cumplen la condición establecida.

Mi problema es cómo conectar las dos ventanas. Por más que lo intento me da 
errores del tipo: Gtk-CRITICAL **; gtk_tree_model_filter_refilter: assertion 
'GTK_IS_MODEL_FILTER(filter)' failed

¿Me podéis ayudar? Os dejo parte del código.
Muchas gracias
        
        Mount

static gboolean
Filter_func (GtkTreeModel *model,
                        GtkTreeIter *iter,
                        gpointer data)
{
        gchar *grp;
        gboolean ret = FALSE;

        gtk_tree_model_get (model, iter, COL_GROUP, &grp, -1);
        if (strcmp (grp, selname) == 0)
        {
                ret = TRUE;
        }
        g_free (grp);
        return ret;
}

static void
group_selected (GtkTreeSelection *selection,
                                gpointer data)
{
        GtkTreeModel *treeview;
        GtkTreeIter iter;
        GtkTreeModel *model;
        gchar *name;

        GtkWidget       *widget = lookup_widget (GTK_WIDGET (window), 
"treeview");

        treeview = gtk_tree_view_get_model (GTK_TREE_VIEW (widget));

        if (gtk_tree_selection_get_selected (selection, &model, &iter))
        {
                gtk_tree_model_get (model, &iter, COL_NAME, &name, -1);
                selname = name;
                g_print ("You selected: %s\tselname: %s\n", name, selname);
                g_free (name);
        }
        gtk_tree_model_filter_refilter (GTK_TREE_MODEL_FILTER (treeview));
}

static void
add_col_groups (GtkTreeView  *treeview, 
                                GtkTreeModel *groups_model)
{
        GtkCellRenderer *renderer;
        GtkTreeSelection *select;

        renderer = gtk_cell_renderer_text_new ();
        g_object_set (renderer,
                                "editable", FALSE,
                                NULL);

        g_object_set_data (G_OBJECT (renderer), "column", GINT_TO_POINTER 
(COL_NAME));

        gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (treeview),
                                                                                
                -1, "Name", renderer,
                                                                                
                "text", COL_NAME,
                                                                                
                NULL);

        select = gtk_tree_view_get_selection (GTK_TREE_VIEW (treeview));
        gtk_tree_selection_set_mode (select, GTK_SELECTION_SINGLE);
        g_signal_connect (G_OBJECT (select), "changed",
                                        G_CALLBACK (group_selected),
                                        NULL);
}

GtkWidget *
do_editable_cells (GtkWidget *do_widget)
{
        GtkWidget               *sw1;
        GtkWidget               *sw2;
        GtkWidget               *treeview;
        GtkWidget               *groupsview;
        GtkTreeModel    *items_model;
        GtkTreeModel    *groups_model;
        GtkTreeModel    *treeviewfilter;

        sw1 = gtk_scrolled_window_new (NULL, NULL);
        sw2 = gtk_scrolled_window_new (NULL, NULL);
        
        /* crea los modelos */
        items_model = create_items_model ();
        groups_model = create_groups_model ();

        /* crea el tree view */
        treeviewfilter = gtk_tree_model_filter_new (items_model, NULL);
        treeview = gtk_tree_view_new_with_model (treeviewfilter);
        gtk_tree_view_set_rules_hint (GTK_TREE_VIEW (treeview), TRUE);
        gtk_tree_selection_set_mode (gtk_tree_view_get_selection (GTK_TREE_VIEW 
(treeview)),
                                                                
GTK_SELECTION_SINGLE);

        add_columns (GTK_TREE_VIEW (treeview), items_model);

        /* crea el groups view */
        groupsview = gtk_tree_view_new_with_model (groups_model);
        gtk_tree_view_set_rules_hint (GTK_TREE_VIEW (groupsview), TRUE);
        gtk_tree_selection_set_mode (gtk_tree_view_get_selection (GTK_TREE_VIEW 
(groupsview)),
                                                                
GTK_SELECTION_SINGLE);

        add_col_groups (GTK_TREE_VIEW (groupsview), groups_model);

        gtk_tree_model_filter_set_visible_func (GTK_TREE_MODEL_FILTER 
(treeviewfilter),
                                                                                
        Filter_func, NULL, NULL);

        gtk_container_add (GTK_CONTAINER (sw1), groupsview);
        gtk_container_add (GTK_CONTAINER (sw2), treeview);
        .....
        return window;
}

int
main (int argc, char **argv)
{
        gtk_init (&argc, &argv);
        do_editable_cells (window);
        gtk_main ();
        return 0;
}





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