disabling a menu from Gtk::ActionGroup

[eduardo fiss beloni <eduardobeloni yahoo com br>]

hello,
I need disable a menu from an Gtk::ActionGroup (i.e.,
if there is nothing on clipboard, nothing can be
pasted, so the paste option is disabled). is it
possible?
how do I do it?

thanks

"A machine can do the work of fifty ordinary men, but no machine can do the work of one extraordinary man."

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