title: NgbPopover with Fullcalendar angular 5
body: <p>I'm having trouble using the NgbPopover component along with fullcalendar.
  In the FullCalendar eventRender I'm inserting the required attributes for ngbPopover, but it does not execute.</p>
  
  <pre><code>eventRender(dados) {
          let title = dados.event.title
          let description = dados.event.description
          let el = dados.element[0]
          el.setAttributeNS(null, "popoverTitle", title)
          el.setAttributeNS(null, "ngbPopover", description != undefined ? description : "" ) 
          el.setAttributeNS(null, "triggers", "mouseenter:mouseleave")
      }
  </code></pre>
  
  <p>I need a way to run Popover after doing the inserts of the attributes in html.</p>
  
  <p>When I put the code straight into the html without going through the eventRender it works.</p>