grid selType: 'checkboxmodel', 取消没行选中

让grid中选中的行 取消选中 

var sel_Model = me.equipmentGrid.getSelectionModel();                var sel_records = sel_Model.getSelection();                for (var i = 0; i < sel_records.length; i++) {                    var sel_record = sel_records[i];                    if (sel_record.get("trackername") == component.title) {                        sel_Model.deselect([sel_record])                        break;                    }                }