code: function() {
          this.logger.log("completeRender: " + this.index + ", # of children: " + this.children.length);
          var sb = [];
  
          for (var i=0; i < this.children.length; ++i) {
              // this.children[i].childrenRendered = false;
              sb[sb.length] = this.children[i].getHtml();
          }
          
          this.childrenRendered = true;
  
          return sb.join("");
      }
docs: Called when we know we have all the child data.
  @method completeRender
  @return {string} children html