A text entry box with a prepopulated drop down list of values.
This widget is similar to a GtkComboBox with the exception that the user is allowed to enter a value that is not present in the choice list. It displays the selected value in a GtkEntry so that user can modify an exisiting value, or enter a new one.
Like, the GtkComboBox, this widget may have an underlying model, or use the convenient new_text constructor. If you use a model, your model must always have a text column that can be set by the set_text_column() function.
You may retrieve the text from the entry via the get_active_text function.
GtkComboBoxEntry without creating a model.GtkComboBoxEntry::new_with_model (model, text_column);--