ComboBoxText set_editable equivalent

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To Whom It May Concern,
I'm using gtkmm to build a C++ video stream converter. There are
several fields which only need be edited under certain format
profiles. Most of these fields are Gtk::ComboBoxText widgets. I need
an equivalent for set_editable to prevent the user from selecting a
nonsensical combination, but I am unable to find it. In short,
what is the best practice to grey-out a ComboBoxText widget?

Thanks in Advance,
- Greg S.

P.S.
Please CC me at inittab AT unixdev.net.

-- 
Greg Schenzel: inittab@xxxxxxxxxxx
UNIX Administrator, IP Networking Specialist
WWW: inittab.netizenweb.com, www.unixdev.net
ICQ: 57800324, Yahoo: idle_resonance, AIM: Idle Resonance

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