In totem.glade:
		<widget class="GtkComboBox" id="tpw_visuals_type_combobox">
		  <property name="visible">True</property>
		  <property name="items" translatable="yes"></property>
		  <property name="add_tearoffs">False</property>
		  <property name="focus_on_click">True</property>
		</widget>

In totem.ui:
	        <object class="GtkListStore" id="tpw_visuals_type_liststore">
                                <columns>
                                  <column type="gchararray"/>
                                </columns>
                                <data>
                                </data>
                              </object>
		<object class="GtkComboBox" id="tpw_visuals_type_combobox">
		  <property name="visible">True</property>
		  <property name="add_tearoffs">False</property>
		  <property name="focus_on_click">True</property>
		  <property name="model">tpw_visuals_type_liststore</property>
		  <signal name="changed" handler="visual_menu_changed"/>
		</object>


With the glade file, a text cell renderer was created automatically, so that it was enough to do:
gtk_combo_box_append_text (combobox, text);
to add new items to the list.

With GtkBuilder, I need to add a text cell renderer to the combobox myself, as done in gtk_combo_box_new_text().

What would I need to do to add the text cell renderer to the combobox in the .ui file?