ch08s04:
	Really there's no way to iterate the selection except via signals?
	We're not Java with inline functions: it's quite inconvenient... :(

ch08s04:
	refTreeSelection->selected_foreach( 
	    SigC::Slot(*this, &TheClass::selected_row_callback) );
	 should be
	refTreeSelection->selected_foreach( 
	    SigC::slot(*this, &TheClass::selected_row_callback) );

ch08s04:
	ItemList.cc:223: error: passing `const Gtk::TreeSelection' as `this' argument
	   of `void Gtk::TreeSelection::selected_foreach(const SigC::Slot1<void, const
	   Gtk::TreeIter&>&)' discards qualifiers
	Is there a way to get the list of rows from a
	   Glib::RefPtr<const Gtk::TreeSelection>

ch08s02:
	It says "or derive a custom CellRenderer."  However, it is never
	explained how to do to derive a custom CellRenderer, except by directly
	looking into cellrenderercustom example.
