使用ui-grid，如何从嵌套行访问$scope？

<div ui-grid="gridOptions" class="grid"></div>

$scope.gridOptions = {
  columnDefs: [
    { field: 'name', displayName: 'Name' },
    { field: 'age', displayName: 'Age' }
  ],
  data: [
    { name: 'John', age: 25 },
    { name: 'Jane', age: 30 }
  ],
  rowTemplate: '<div ng-repeat="col in colContainer.renderedColumns track by col.colDef.name" class="ui-grid-cell" ui-grid-cell></div>',
  onRegisterApi: function(gridApi) {
    $scope.gridApi = gridApi;
  }
};

<div class="ui-grid-row" ng-repeat="row in rowContainer.renderedRows track by $index">
  <div class="ui-grid-cell" ng-repeat="col in colContainer.renderedColumns track by col.colDef.name">
    <span ng-if="col.colDef.name === 'name'">{{row.entity.name}}</span>
    <span ng-if="col.colDef.name === 'age'">{{row.entity.age}}</span>
    <button ng-click="grid.appScope.editRow(row)">Edit</button>
  </div>
</div>