code: function( container, node ) {
  		if( node.type === 'stack' ) {
  			node.contentItems.forEach( function( item ) {
  				container.addChild( item );
  				node.removeChild( item, true );
  			} );
  		}
  		else {
  			node.contentItems.forEach( lm.utils.fnBind( function( item ) {
  				this._addChildContentItemsToContainer( container, item );
  			}, this ) );
  		}
  	}
docs: Adds all children of a node to another container recursively.
  @param {object} container - Container to add child content items to.
  @param {object} node - Node to search for content items.
  @returns {void}