Gtk::ComboDropDown on_select_child(Widget& item)

["Rose Cumming" <rose_alice_cumming hotmail com>]

Hello,

Does anybody know the semantics for connecting to this member function:
on_select_child(Widget& item)

I have a Gtk::Combo widget and I can get on_selection_changed working.
i.e.
SigC::Slot0<void> signalSlot = SigC::slot(*this, 
&ExampleWindow::selection_changed);
m_Combo.get_list()->signal_selection_changed().connect(signalSlot);

But I don't know how to do that for on_select_child because it takes a 
widget item as an argument?

Also, is this function let the application knows which item on the pull-down 
list is selected?

Your help is greatly appreciated.

Thank you,
Rose

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