AngularJS Example:

HTML

<div ng-app="fiddle" ng-controller="MainCtrl">
      <h1>Possibly a bug on Angular.js</h1>
    <div class="btn-group" data-toggle="buttons-radio">
       <a href="#" class="btn btn-mini"  ng-click="public_on='btn-mini btn';">Off</a>
       <a href="#" ng-class="public_on" ng-click="public_on='btn btn-mini btn-success';">On</a>
    </div>
</div>

CSS

</style> <!-- Ugly Hack due to jsFiddle issue: http://goo.gl/BUfGZ --> 
<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.0.2/angular.min.js"></script>
<style>

JavaScript

var app = angular.module('fiddle', []);

app.controller('MainCtrl', function($scope) {
});