angular-ui-bootstrap accordion collapse/expand all - angularjs

Question

I would like to create a collpase/expand all button for a set of accordions. I am using angular.js v1.2.6 and angular-bootstrap-ui 0.9.0. I haven't been able to find an example of how to do a collpase/expand all. I'm an angular novice and any advice or suggestions is appreciated.
ALSO, I should add that the solution in this post doesn't work in the newer version of angular.js (v1.0.8 vs v1.2.6) that I am using (which is a latest version at the time of this posting). In the newer version it throws an error about trying to create two isolated scopes.
Markup:
<div ng-controller="myCtlr">
<accordion close-others="oneAtATime">
<button class="btn" ng-click="section.isCollapsed = !section.isCollapsed">Toggle Sections</button>
<accordion-group ng-repeat="section in sections" is-open="section.isOpen">
<accordion-heading>
<div class="accordion-heading-content" ng:class="{collapsed: section.isOpen}">
{{section.name}}
</div>
</accordion-heading>
Section content
</accordion-group>
</accordion>
</div>
JS:
var theapp = angular.module('myApp', [
'ui.bootstrap'
])
function myCtlr ($scope) {
$scope.isCollapsed = false;
$scope.sections = [
{'id': '353','otherid': '7','name': 'One','Sequence': '1'},
{'id': '354','otherid': '8','name': 'Two','Sequence': '1'},
{'id': '355','otherid': '9','name': 'Three','Sequence': '1'}
];
}

Answer 1

I've taken Blowsie's plunkr comment and built my own answer that solves the use case that I'm reading into here.
I've moved the close-others attribute to the accordion element where the docs say it goes. I've also added extra buttons to openAll, closeAll or toggleAll.
If you click the header for a single item, only that item opens. If you click a 'All' button, all are affected.
Thanks to Blowsie for the inspiration. I think using the item.open here was the ticket. After that, it's just a matter of affecting all item.open values.
http://plnkr.co/edit/WUKEfcBrSf3XrIQAik67?p=preview
HTML
<div ng-controller="AccordionDemoCtrl">
<accordion close-others="false">
<accordion-group ng-repeat="item in items" is-open="item.open" heading="{{item.name}}">
{{item.open}}
<p>The body of the accordion group grows to fit the contents</p>
</accordion-group>
</accordion>
<button ng-click="openItem(0)">Open 1</button>
<button ng-click="openItem(1)">Open 2</button>
<button ng-click="openItem(2)">Open 3</button>
<button ng-click="openAllItems()">Open All</button>
<button ng-click="closeAllItems()">Close All</button>
<button ng-click="toggleAllItems()">Toggle All</button>
<br/>
{{items |json}}
</div>
JS
angular.module('plunker', ['ui.bootstrap']);
function AccordionDemoCtrl($scope) {
$scope.oneAtATime = true;
$scope.items = [
{name: 'Item 1', open: false},
{name: 'Item 2', open: false},
{name: 'Item 3', open: false}
];
$scope.addItem = function() {
var newItemNo = $scope.items.length + 1;
$scope.items.push('Item ' + newItemNo);
};
$scope.openItem = function(idx) {
console.log(idx);
$scope.items[idx].open = true;
};
$scope.openAllItems = function(){
$scope.items.map(function(item){
item.open = true;
});
};
$scope.closeAllItems = function(){
$scope.items.map(function(item){
item.open = false;
});
}
$scope.toggleAllItems = function(){
$scope.items.map(function(item){
item.open = !item.open;
});
}
}

Answer 2

Here is a method using the is-open attribute.
http://plnkr.co/edit/MliW41xGJAF0Mnw4Rgu7?p=preview