gistfile1.txt

Custom View:  This works

Todos.ScrollingList = SC.View.extend(
/** @scope Todos.ScrollingList.prototype */ {

render: function(context){
  
  var template = SC.TEMPLATES['todos']();
  context.push(template);
}

});

working template:
<h1>Todos</h1>

Kaboom template:
<h1>Todos</h1>

{{#view "Todos.CreateTodoView"}}
  <input id="new-todo" type="text" placeholder="Wot?" >
{{/view}}

Todos.CreateTodoView is defined:
Todos.CreateTodoView = SC.TemplateView.create(SC.TextFieldSupport, {
  insertNewline: function() {
    var value = this.get('value');

    if (value) {
      Todos.todoListController.createTodo(value);
      this.set('value', '');
    }
  }
});