public SComboBox(ComboBoxModel dataModel) { if (dataModel == null) { throw new IllegalArgumentException("dataModel must not be null"); }  this.dataModel = dataModel; selectionModel = createSelectionModel();
public SComboBox(ComboBoxModel model) { setModel(model);
    public SComboBox(ComboBoxModel dataModel)    {        if (dataModel == null) {            throw new IllegalArgumentException("dataModel must not be null");        }        this.dataModel = dataModel;        selectionModel = createSelectionModel();    }