code: function(sId, oBindingContext) {
  									var oAvailableRoleType = oBindingContext.getObject();
  									return new Item({
  										key: oAvailableRoleType.key,
  										text: oAvailableRoleType.text
  									});
  								}
docs: sorter: [ new sap.ui.model.Sorter("/text", false) ],