Gtk.CellRendererCombo:text-column
"text-column" Number : Read / Write
Specifies the model column which holds the possible values for the combo box.
Note that this refers to the model specified in the model property, <emphasis>not</emphasis> the model backing the tree view to which this cell renderer is attached.
Gtk.CellRendererCombo automatically adds a text cell renderer for this column to its combo box.
Since 2.6