Clear the pull-down menu.

[Arbol One <arbolone gmail com>]

Uisng 'Gtk::ComboBoxEntryText' I display the data chosen by the user,
however, after the user has made his/her first choice and having the data
displayed in the 'Gtk::ComboBoxEntryText', s/he might go back and chose
again. Giving this scenario, 'Gtk::ComboBoxEntryText' displays the data from
the first choice plus the data from the second choice. Is there a way to
clear the data in the pull-down menu? Say, something like...
Gtk::ComboBoxEntryText::clear().

Thanks

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