code: public final void setSelectionList(Object[] keys, Object[] labels)
      {
          selectionListKeys = keys;
          selectionListLabelMessages = createLabels(getId(), labels);
          combobox.setModel(new DefaultComboBoxModel(selectionListLabelMessages));
          selectItem(getValue());
      }
docs: Replace the comboBoxModel in order to use the new keys/labels.
  
  @param keys
  array of objects to use as keys.
  @param labels
  array of objects to use as labels in the comboBox.