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Kendo UI Grid Only Expand One Row at a Time

detailExpand function
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var grd = "#dvGrid";
$(grd).kendoGrid({
                    dataSource: donorData,
                    detailInit: detailInit,
                    detailExpand: function (e) {
                        $(grd + " tr.k-detail-row").hide();
                        $(grd + " tr.k-master-row").find(".highlightrow").removeClass("activerow");
                        $(grd + " div.k-hierarchy-cell").find("a").removeClass("k-minus").addClass("k-plus");

                        $(e.masterRow).find(".highlightrow").addClass("activerow");
                        $(e.masterRow).find("div.k-hierarchy-cell").find("a").removeClass("k-plus").addClass("k-minus");
                    },
                    detailCollapse: function (e) {
                        $(e.masterRow).find(".highlightrow").removeClass("activerow");
                    },

.................
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