title: Get last item view from CompositeView in Marionette
body: <p>Is it possible to get the last ItemView from a Backbone CompositeView? I've found a lot of documentation for getting the last model in a Collection, but not that last View in a Collection of Views.</p>
  
  <p>The reason I would like to do this is so I can render the last row in a table slightly differently.</p>
  
  <p>The following is the code I'm using right now, it works fine, but it would be less "hacky" if I could get the correct ItemView from the CompositeView that created and rendered it. It uses jQuery to search the entire part of the DOM contained by the CompositeView for the last element, then manipulates that element.</p>
  
  <pre><code>B.ListControl.View = Backbone.Marionette.CompositeView.extend({
      itemView: ...,
      itemViewContainer: ...,
      template: ...,
      // ON RENDER
      onRender: function(){
          // Add button to the last element in the list
          this.$el.find('div:last').text('Custome stuff goes here');
      }
  });
  </code></pre>
  
  <p>Thanks!</p>