I have tried the code in http://angular-ui.github.io/bootstrap/#/modal. The windowTemplateUrl does not embed the data in templateUrl.Here is my plunk: https://plnkr.co/edit/6zM6VXDPjvl3yRewkNsV?p=preview
index.html
<!doctype html>
<html ng-app="ui.bootstrap.demo">
<head>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular-animate.js"></script>
<script src="//angular-ui.github.io/bootstrap/ui-bootstrap-tpls-1.1.2.js"></script>
<script src="example.js"></script>
<link href="//netdna.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div ng-controller="ModalDemoCtrl">
<button type="button" class="btn btn-default" ng-click="open()">Open me!</button>
<button type="button" class="btn btn-default" ng-click="open('lg')">Large modal</button>
<button type="button" class="btn btn-default" ng-click="open('sm')">Small modal</button>
<button type="button" class="btn btn-default" ng-click="toggleAnimation()">Toggle Animation ({{ animationsEnabled }})</button>
<div ng-show="selected">Selection from a modal: {{ selected }}</div>
</div>
</body>
</html>