AngularJS Example Plunkr

var app = angular.module('app', ['ngAnimate', 'ngTouch', 'ui.grid', 'ui.grid.treeView' ]);

app.controller('MainCtrl', ['$scope', '$http', '$interval', 'uiGridTreeViewConstants','uiGridTreeBaseService',function ($scope, $http, $interval, uiGridTreeViewConstants,uiGridTreeBaseService ) {
 
  
  $scope.gridOptions = {
    enableSorting: true,
    enableFiltering: true,
    showTreeExpandNoChildren: true,
    showTreeRowHeader: false,
    columnDefs: [
      { name: 'name', width: '30%' , cellTemplate : "<div class=\"ui-grid-cell-contents\" title=\"TOOLTIP\"><div style=\"float:left;\" class=\"ui-grid-tree-base-row-header-buttons\" ng-class=\"{'ui-grid-tree-base-header': row.treeLevel > -1 }\" ng-click=\"grid.appScope.toggleRow(row,evt)\"><i ng-class=\"{'ui-grid-icon-minus-squared': ( ( grid.options.showTreeExpandNoChildren && row.treeLevel > -1 ) || ( row.treeNode.children && row.treeNode.children.length > 0 ) ) && row.treeNode.state === 'expanded', 'ui-grid-icon-plus-squared': ( ( grid.options.showTreeExpandNoChildren && row.treeLevel > -1 ) || ( row.treeNode.children && row.treeNode.children.length > 0 ) ) && row.treeNode.state === 'collapsed'}\" ng-style=\"{'padding-left': grid.options.treeIndent * row.treeLevel + 'px'}\"></i> &nbsp;</div>{{COL_FIELD CUSTOM_FILTERS}}</div>" },
      { name: 'gender', width: '20%' },
      { name: 'age', width: '20%' },
      { name: 'company', width: '25%' },
      { name: 'state', width: '35%' },
      { name: 'balance', width: '25%', cellFilter: 'currency' }
    ],
    onRegisterApi: function( gridApi ) {
      $scope.gridApi = gridApi;
      $scope.gridApi.treeBase.on.rowExpanded($scope, function(row) {
        if( row.entity.$$hashKey === $scope.gridOptions.data[50].$$hashKey && !$scope.nodeLoaded ) {
          $interval(function() {
            $scope.gridOptions.data.splice(51,0,
              {name: 'Dynamic 1', gender: 'female', age: 53, company: 'Griddable grids', balance: 38000, $$treeLevel: 1},
              {name: 'Dynamic 2', gender: 'male', age: 18, company: 'Griddable grids', balance: 29000, $$treeLevel: 1}
            );
            $scope.nodeLoaded = true;
          }, 2000, 1);
        }
      });
    }
  };

 $http.get('https://cdn.rawgit.com/angular-ui/ui-grid.info/gh-pages/data/500_complex.json')
 .success(function(data) {
   for ( var i = 0; i < data.length; i++ ){
     data[i].state = data[i].address.state;
     data[i].balance = Number( data[i].balance.slice(1).replace(/,/,'') );
   }
   data[0].$$treeLevel = 0;
   data[1].$$treeLevel = 1;
   data[10].$$treeLevel = 1;
   data[11].$$treeLevel = 1;
   data[20].$$treeLevel = 0;
   data[25].$$treeLevel = 1;
   data[50].$$treeLevel = 0;
   data[51].$$treeLevel = 0;
   $scope.gridOptions.data = data;
 });

  $scope.expandAll = function(){
    $scope.gridApi.treeBase.expandAllRows();
  };

  $scope.toggleRow = function( row,evt ){
    uiGridTreeBaseService.toggleRowTreeState($scope.gridApi.grid, row, evt);
    //$scope.gridApi.treeBase.toggleRowTreeState($scope.gridApi.grid.renderContainers.body.visibleRowCache[rowNum]);
  };

  $scope.toggleExpandNoChildren = function(){
    $scope.gridOptions.showTreeExpandNoChildren = !$scope.gridOptions.showTreeExpandNoChildren;
    $scope.gridApi.grid.refresh();
  };
}]);

.grid {
  width: 500px;
  height: 400px;
}

<!doctype html>
<html ng-app="app">
  <head>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.js"></script>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular-touch.js"></script>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular-animate.js"></script>
    <script src="http://ui-grid.info/docs/grunt-scripts/csv.js"></script>
    <script src="http://ui-grid.info/docs/grunt-scripts/pdfmake.js"></script>
    <script src="http://ui-grid.info/docs/grunt-scripts/vfs_fonts.js"></script>
    <script src="http://ui-grid.info/release/ui-grid-unstable.js"></script>
    <link rel="stylesheet" href="http://ui-grid.info/release/ui-grid-unstable.css" type="text/css">
    <link rel="stylesheet" href="main.css" type="text/css">
  </head>
  <body>

<div ng-controller="MainCtrl">
  <button id="expandAll" type="button" class="btn btn-success" ng-click="expandAll()">Expand All</button>
  <button id="toggleFirstRow" type="button" class="btn btn-success" ng-click="toggleRow(0)">Toggle First Row</button>
  <button id="toggleSecondRow" type="button" class="btn btn-success" ng-click="toggleRow(1)">Toggle Second Row</button>
  <button id="toggleExpandNoChildren" type="button" class="btn btn-success" ng-click="toggleExpandNoChildren()">Toggle Expand No Children</button>
  <div id="grid1" ui-grid="gridOptions" ui-grid-tree-view class="grid"></div>
</div>


    <script src="app.js"></script>
  </body>
</html>