Happens client-side.
Find all of sub view DOM elements
Get the view key
Call this.getView()
Attach childView
function(callback) {
    var _baseView = this;

    // Remove all child views in case we are re-rendering through
    // manual .render() or 'refresh' being triggered on the view.
    this.removeChildViews();
    BaseView.getChildViews(this.app, this, function(views) {
      _baseView.childViews = views;
      callback.call(_baseView);
    });
  }