Gtk::notebook - switching tabs changes stuff outside?

["Sudrien" <sudrien fusemail com>]

http://svn.berlios.de/viewcvs/darimasen/trunk/src/darimasen.cpp?rev=27&view=markup
if additional reference is needed...

I have a Gtk::Notebook, "tabber", which shows the contents of different
directories in different tabs.  I  want to change items outside tabber
when a different tab is selected - but I can't get the one signal
available in 2.4.x to compile.

Abridged code:

   void Darimasen::tabberSwitched(GtkNotebookPage*, guint);

...

  Tabber = Gtk::manage(new Gtk::Notebook);
  Tabber->signal_switch_page.connect(sigc::mem_fun(*this,
&Darimasen::tabberSwitched));

I get "error: insufficient contextual information to determine type"

If this is the wrong signal to use, what could I use?

-Sud.