Combo box issue

[Jamiil <arbolone gmail com>]

Hello folks,
In a 'Gtk::ComboBoxEntryText' are four items that are set as 
'prepend_text', [Fruit, Vegetable, Meat, Fish]. When the user select one 
of this items from the list the user thens move to another combo box 
that will display only the names of fruits or vegetables or meats or 
types of fish that are stored in a STL container [vector], depending on 
what the user has selected. What I would like to do is to , as soon as 
the cursor moves to the second pop up box, retrieve from the STL 
container all the instances of the user's selection [names of different 
fruits, veggies, meats or types of fish].
Now, how can I find out when the user has made a selection in the first 
combo box? Is there a signal send by 'Gtk::ComboBoxEntryText' that I 
should catch?

Thanks in advance

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