public static DefaultComboBoxModel createParameterTypesModel()
{
final DefaultComboBoxModel model = new DefaultComboBoxModel();
model.addElement(null);
model.addElement(new ParameterType(ParameterAttributeNames.Core.TYPE_DROPDOWN,
Messages.getString("ParameterDialog.ParameterType.DropDown"), false, false));
model.addElement(new ParameterType(ParameterAttributeNames.Core.TYPE_LIST,
Messages.getString("ParameterDialog.ParameterType.SingleValueList"), false, false));
model.addElement(new ParameterType(ParameterAttributeNames.Core.TYPE_LIST,
Messages.getString("ParameterDialog.ParameterType.MultiValueList"), true, false));