making menuitems insensitive by app context

[Rob Benton]

I'm looking for a way, maybe a signal, to make my menuitems 
sensitive/insensitive based on the state of my program.  Using 
gnome-terminal as an example, something like:

Edit->Copy
only being sensitive when you have text highlighted.

Is there some way I can capture the click/button_press of the Gtk::Menu?
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