code: function() {
          this.setChildren(this.get('inputs').concat(this.get('children') || []));
  
          var ancestor = this.get('parent.parent');
          if(ancestor) {
            ancestor.setChildren(this.get('outputs').concat(ancestor.get('children') || []));
          }
          this.set('_additionalsIncluded', true);
        }
docs: Include sources and sinks in the children list, so that they are displayed