GNOME Bugzilla – Bug 667328
Support "id" tag in GtkComboBoxText items format
Last modified: 2013-05-19 12:31:08 UTC
Now the combo box supports setting the "id" of every item in the <items> format. See bug 667319 Need to extend Glade editors to support configuring the id as well.
This was fixed last week and now the "id" attributes are editable for GtkComboBoxText (in git master)