[gtkmm] Custom store class

[Tim Flechtner <timf trdlnk com>]

hello,
  i'm trying to write my own store class for use with a TreeView, and 
am getting tripped up (i think) on the glib object system.

i've defined a class:
class Store_c : public TreeModel, public Glib::Object
{
  public:
    Store_c();
    ~Store_c();

  private:
};

with a ctor implementation of:
Store_c::Store_c()
    : TreeModel(), Glib::Object()
{
}

in my main.C, i do this:
main(int argc, char** argv)
{
  Gtk::Main kit(argc, argv);
  View_c view;
  ColumnRecord_c column_record;
  Glib::RefPtr<Store_c> store_gptr(new Store_c());
  view.set_model(store_gptr);
  view.append_column("Column Title", column_record.m_column);


  Window window;
  window.add(view);
  window.show_all();

  kit.run(window);

  return 0;
}


it builds, but when i run the resulting binary i get:


(store:28951): glibmm-CRITICAL **: file interface.cc: line 53 
(Glib::Interface::Interface(const Glib::Interface_Class &)): assertion 
`gobject_ != 0' failed

(store:28951): glibmm-WARNING **: Object::Object(): Did you really mean 
to call this?

(store:28951): Gtk-CRITICAL **: file gtktreemodel.c: line 697 
(gtk_tree_model_get_n_columns): assertion `GTK_IS_TREE_MODEL 
(tree_model)' failed

(store:28951): GLib-GObject-WARNING **: 
gsignal.c:1893:g_signal_connect_data(): signal `row_changed' is invalid 
for instance `80c5280'

(store:28951): GLib-GObject-WARNING **: 
gsignal.c:1893:g_signal_connect_data(): signal `row_inserted' is invalid 
for instance `80c5280'

(store:28951): GLib-GObject-WARNING **: 
gsignal.c:1893:g_signal_connect_data(): signal `row_has_child_toggled' 
is invalid for instance `80c5280'

(store:28951): GLib-GObject-WARNING **: 
gsignal.c:1893:g_signal_connect_data(): signal `row_deleted' is invalid 
for instance `80c5280'

(store:28951): GLib-GObject-WARNING **: 
gsignal.c:1893:g_signal_connect_data(): signal `rows_reordered' is 
invalid for instance `80c5280'

(store:28951): Gtk-CRITICAL **: file gtktreemodel.c: line 738 
(gtk_tree_model_get_iter): assertion `GTK_IS_TREE_MODEL (tree_model)' failed



the signal warnings make sense to me, since i haven't built out Store_c 
to provide the necessary interfaces/signals yet, but the failed 
GTK_IS_TREE_MODEL and gobject_ !=  NULL assertions lead me to believe 
i've already missed a key step.  can anyone point out relevant 
documentation, or explain what i'm gdoing wrong?  i've been looking at 
the code for ListStore, but i think there is enough difference between 
ListStore, which wraps an existing gtk (not mm) widget and what i'm 
doing (no gtk widget, just a c++ class) that i can't just emulate what i 
found there.

thanks!
-tim