Multiple columns in a ComboBoxEntry

I am pretty new to PyGTK and am having some trouble trying to get a
comboboxentry with multiple columns in it.

I am using glade 2.6.7, pygtk 2.4.1 on Gentoo linux

I am trying to rewrite an Access database GUI in pygtk. In Access I have
a combobox that has multiple columns, including one with the primary key
that is hidden. I select the entry using the combobox and jump to the
entry with that primary key. I would like to do something similar with
pygtk.

As the ComboBoxEntry widget is reasonably new I am finding it difficult
to find more complex examples of how to use it. I am already using John
Finlay's tutorial and reference.

I am trying to use a ComboBoxEntry with a multiple column liststore. It
is partially working. I can load all the columns into the list store but
I can only display one at a time. Is there anyway to display multiple
columns? Or should I be using a TreeStore?

The ComboBoxEntry is created by glade. Then I use the following code:

        combo_widget = widgets.get_widget('comboboxentry')
        liststore = gtk.ListStore(str, str, str, str)
        for r in rows:
            liststore.append(r)
        combo.set_model(liststore)
        combo.set_text_column(1)

thanks for your suggestions
Greg
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