Html form inside popover - angularjs

Question

I am trying to create a custom popover with a html form in angularjs. The idea is that, when the user press the button with the popover, it shows 5 radio buttons inside. Each radio button has a message that is printed under the button when the radio button is checked.
Here is the directive code:
var customPopoverApp=angular.module('customPopOverApp',[]);
customPopoverApp.directive('customPopover',['$compile','$templateCache',function($compile,$templateCache){
return {
restrict:'A',
transclude:true,
template:"<span>Click on me to show the popover</span>",
link:function(scope,element,attr){
var contentHtml = $templateCache.get("customPopover.html");
contentHtml=$compile(contentHtml)(scope);
$(element).popover({
trigger:'click',
html:true,
content:contentHtml,
placement:attr.popoverPlace
});
}
};
}]);
Here is the main html template:
Popover test
<div class="navbar navbar-default menu-nav" role="navigation">
<ul class="nav navbar-nav navbar-left">
<li>
<button custom-popover="" popover-place="bottom">click on me to show the popover</button>
</li>
</ul>
</div>
</div>
<script type="text/ng-template" id="customPopover.html">
<h2>Organizacion de la tabla</h2>
<div class="radio">
<label>
<input type='radio' ng-checked="option1" ng-click='showMessage("Option 1 checked")'/> Option 1<br/>
</label>
</div>
<div class="radio">
<label>
<input type='radio' ng-checked="option2" ng-click='showMessage("Option 2 checked")'/> Option 2<br/>
</label>
</div>
<div class="radio">
<label>
<input type='radio' ng-checked="option3" ng-click='showMessage("Option 3 checked")'/> Option 3<br/>
</label>
</div>
<div class="radio">
<label>
<input type='radio' ng-checked="option4" ng-click='showMessage("Option 4 checked")'/> Option 4<br/>
</label>
</div>
<div class="radio">
<label>
<input type='radio' ng-checked="option5" ng-click='showMessage("Option 5 checked")'/> Option 5<br/>
</label>
</div>
</script>
<div ui-view></div>
and here is the plunker with the full example:
http://plnkr.co/edit/ccb5MR?p=preview
The popover works fine... the first time. If I close the popover and I open again, It is as if it had never been compiled
Does any of you know why the popover does not work the second time?