buildComboDataSource: function (endpoint, sortField, pageSize) {
                return {
                    type: "odata-v4",
                    transport: {
                        read: {
                            url: this.odata.url() + endpoint,
                            dataType: "json",
                            xhrFields: {
                                withCredentials: true //needed for windows auth
                            }
                        }
                    },
                    schema: {
                        total: function (data) {
                            return data["@odata.count"];
                        }
                    },
                    pageSize: pageSize,
                    serverPaging: pageSize > 0 ? true : false,
                    serverFiltering: true,
                    serverSorting: true,
                    sort: {
                        field: sortField,
                        dir: "asc"
                    }
                };
            }