code: function( stackContainers, node ) {
  		node.contentItems.forEach( lm.utils.fnBind( function( item ) {
  			if( item.type == 'stack' ) {
  				stackContainers.push( item );
  			}
  			else if( !item.isComponent ) {
  				this._findAllStackContainersRecursive( stackContainers, item );
  			}
  		}, this ) );
  	}
docs: Finds all the stack containers.
  
  @param {array} - Set of containers to populate.
  @param {object} - Current node to process.
  
  @returns {void}