code: function() {
  		var allContentItems = [];
  
  		var addChildren = function( contentItem ) {
  			allContentItems.push( contentItem );
  
  			if( contentItem.contentItems instanceof Array ) {
  				for( var i = 0; i < contentItem.contentItems.length; i++ ) {
  					addChildren( contentItem.contentItems[ i ] );
  				}
  			}
  		};
  
  		addChildren( this.root );
  
  		return allContentItems;
  	}
docs: *************************
  PRIVATE
  *************************