Insert LayoutManager views into different positions

gistfile1.js

var MyView = Backbone.View.extend({
// ...

/* Override insert function. */
insert: function(root, child) {
  var $lastView = root.find( ".foo" ).last(),
      $lastBar = root.find( ".foo.bar" ).last();

  if( $lastView.length ) {
    child.insertAfter( $lastView );
  } else if( $lastBar.length ) {
    child.insertAfter( $lastBar );
  } else {
    root.append( child );
  }
}

// ...
})