[gtkmm] Problem with connecting signals to buttonbox buttons.

[Jeff Gavin <jeff ezclick net>]

Our application has an array of button box buttons, or rather what I 
THINK is an array of buttons:

 1 Gtk::Box_Helpers::BoxList& boxlist = buttonbox->children();
 2 Gtk::Box_Helpers::BoxList::iterator i;
 3 int j=0;
 4 for(i=boxlist.begin(); i!=boxlist.end(); i++)
 5 {
 6 	button[j] = dynamic_cast<Gtk::Button*>(i->get_widget());
 7 	button[j]->signal_clicked().
 8 	  connect(SigC::bind<guint>(SigC::slot(*this,
 9 	  &winFunctionButtons::on_button_clicked), j));
10	j++;
11 }

Problem:

When I click on the button, the callback does not happen.

Questions:

How do I know that i->get_widget() on line 6 is returning a button 
pointer?

Could it really be returning something that is not a button?  If so, how 
can I find out what type it really is?

Thanks for you help...it has to be something simple that I'm not seeing.

Regards,

Jeff