custom TreeModel

hello all,

can anyone tell me the list of methods to override in order to create a
custom TreeModel?

I currently have these:
  virtual Gtk::TreeModelFlags get_flags_vfunc() const;
   virtual int get_n_columns_vfunc() const;
   virtual GType get_column_type_vfunc(int index) const;
   virtual void get_value_vfunc(const TreeModel::iterator& iter, int
column, Glib::ValueBase& value) const;

   bool iter_next_vfunc(const iterator& iter, iterator& iter_next)
const;

   virtual bool iter_children_vfunc(const iterator& parent, iterator&
iter) const;
   virtual bool iter_has_child_vfunc(const iterator& iter) const;
   virtual int iter_n_children_vfunc(const iterator& iter) const;
   virtual int iter_n_root_children_vfunc() const;
   virtual bool iter_nth_child_vfunc(const iterator& parent, int n,
iterator& iter) const;
   virtual bool iter_nth_root_child_vfunc(int n, iterator& iter) const;
   virtual bool iter_parent_vfunc(const iterator& child, iterator&
iter) const;
   virtual Path get_path_vfunc(const iterator& iter) const;
   virtual bool get_iter_vfunc(const Path& path, iterator& iter) const;

but I keep getting this when I try to set the model in the treeview:
(gtkmm-demo:6627): GLib-GObject-WARNING **: attempting to add an
interface (GtkTreeModel) to class
(gtkmm__CustomObject_16Memory_TreeModel) after class_init
(gtkmm-demo:6627): Gtk-CRITICAL **: gtk_tree_view_set_model: assertion
'model == NULL || GTK_IS_TREE_MODEL (model)' failed

regards, danny.

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