js/libs/ember-1.5.1.js
function(view, childView, options) {
    var buffer = view.buffer, _childViews = view._childViews;

    childView = view.createChildView(childView, options);
    if (!_childViews.length) { _childViews = view._childViews = _childViews.slice(); }
    _childViews.push(childView);

    childView.renderToBuffer(buffer);

    view.propertyDidChange('childViews');

    return childView;
  }
function(view, childView, options) {
    var buffer = view.buffer, _childViews = view._childViews;

    childView = view.createChildView(childView, options);
    if (!_childViews.length) { _childViews = view._childViews = _childViews.slice(); }
    _childViews.push(childView);

    childView.renderToBuffer(buffer);

    view.propertyDidChange('childViews');

    return childView;
  }
function ( view , childView , options ) { var buffer = view . buffer , _childViews = view . _childViews ; childView = view . createChildView ( childView , options ) ; if ( ! _childViews . length ) { _childViews = view . _childViews = _childViews . slice ( ) ; } _childViews . push ( childView ) ; childView . renderToBuffer ( buffer ) ; view . propertyDidChange ( 'childViews' ) ; return childView ; }
when a view is rendered in a buffer, appending a child view will render that view and append the resulting buffer into its buffer.
when a view is rendered in a buffer appending a child view will render that view and append the resulting buffer into its buffer .