title: Popover Does Not Display When Opened
body: <p>I set up a basic example with Ionic Popover. However, when I open the popover, the opacity stays at zero, preventing the popover from showing. I know the method <code>openPopover</code> is called because I receive the <code>opened</code> console log in my web console. If I remove the opacity property from the console, the popover displays.</p>
  
  <p>My controller..</p>
  
  <pre><code>angular.module('search')
  
  .controller('SearchResultsController', searchResultsController)
  
  searchResultsController.$inject = ['$ionicPopover', '$scope'];
  
  function searchResultsController($ionicPopover, $scope) {
    var vm = this;
  
    vm.openPopover = openPopover;
  
    activate();
  
    function activate( ) {
      $ionicPopover.fromTemplateUrl('/templates/search/filter-popover.html', {
        scope: $scope
      }).then(function(popover) {
        console.log(popover)
        vm.popover = popover;
      });
    }
  
    function openPopover( $event ) {
      console.log("opened")
      vm.popover.show($event);
    }
  }
  </code></pre>
  
  <p>My view page...</p>
  
  <pre><code>&lt;ion-view hide-nav-bar="true"&gt;
    &lt;signed-in-header&gt;&lt;/signed-in-header&gt;
  
    &lt;ion-content class="padding has-header"&gt;
      &lt;div class="row"&gt;
        &lt;div class="col col-75 text-left"&gt;
          &lt;div&gt;4 RESULTS FOR "263355"&lt;/div&gt;
        &lt;/div&gt;
  
        &lt;div class="col col-25 text-right"&gt;
          &lt;div ng-click="searchResults.openPopover()"&gt;
            &lt;i class="icon ion-arrow-down-b"&gt;&lt;/i&gt;
            Filter
          &lt;/div&gt;
        &lt;/div&gt;
      &lt;/div&gt;
    &lt;/ion-content&gt;
  
    &lt;ion-footer-bar&gt;
      Ad here 1
    &lt;/ion-footer-bar&gt;
  &lt;/ion-view&gt;
  </code></pre>
  
  <p>My popover template.</p>
  
  <pre><code>&lt;ion-popover-view&gt;
    &lt;ion-header-bar&gt;
      &lt;h1 class="title"&gt;My Popover Title&lt;/h1&gt;
    &lt;/ion-header-bar&gt;
    &lt;ion-content&gt;
      Hello!
    &lt;/ion-content&gt;
  &lt;/ion-popover-view&gt;
  </code></pre>
  
  <p>Why does the popover not show and how can I fix this?</p>