title: How to access a composite view from an item view instance in Backbone Marionette
body: <p>The basic situation is this:</p>
  
  <p>I have a Composite View and an Item View. I construct the Composite view passing it a model and a collection. The model data is used to populate the template for the Composite view. The collection data is used to populate the Item View for the Composite View.</p>
  
  <p>What I want to do is this: in a template helper for the Item view I want to access the model data for the Composite View. I've got as far as accessing the view instance of the Item View. I thought that might give me a handle on the Composite View, from where I could get  to its model, but it doesn't. </p>
  
  <p>Is there a way  I can do this - access the composite view instance from one of its item view instances?</p>
  
  <p>Thanks</p>
  
  <p>--Justin Wyllie</p>