Partially working example of using SC.TemplateView inside of an SC.ContainerView

Console.js

// Run this in your console/code.

MyApp.mainPage.getPath('mainPane.containerView.testContainerView').set('nowShowing', "MyApp.testView");

container.js

MyApp.ContainerView = SC.View.extend({
  childViews: 'testContainerView'.w(),

  testContainerView: SC.ContainerView.extend({
    layout: { height: 0, bottom: 0, left: 0, right: 0 },

    contentView: SC.LabelView.extend({
      layout: { top: 0, bottom: 0, left: 0, right: 0 },
      value: 'Test'
    })
  })

})

testHandlebarsView.handlebars

<h1>This is the testView</h1>

{{#collection "MyApp.testCollectionView"}}
  <label>testCollectionView:</label>{{content.firstname}}
{{/collection}}

testTemplate.js

MyApp.testView = SC.TemplateView.create({
  templateName: 'testHandlebarsView',
});

MyApp.testCollectionView = SC.TemplateCollectionView.create({
  content: [ {firstname:'Tom'}, {firstname:'Yehuda'} ]
});