gostaríamos de usar páginas de polímero-ui-tabs e polímero-ui-dinamicamente. o exemplo estático a seguir funciona bem (o atributo selecionado está definido corretamente, o evento on-polymer-select é acionado)

  <polymer-ui-tabs selected="{{selectedTab}}" on-polymer-select="{{mymethod}}">
    <span>One</span>
    <span>Two</span>
    <span>Three</span>
  </polymer-ui-tabs>

  <polymer-ui-pages selected="{{selectedTab}}" on-polymer-select="{{mymethod2}}" flex>
    <span>One</span>
    <span>Two</span>
    <span>Three</span>
  </polymer-ui-pages>

Ao construir o dom dinamicamente, o evento on-polymer-select nunca é acionado e o atributo selecionado é definido apenas para as guias ui do polímero.

@CustomTag('ve-result-dyn')
 class ResultElementDyn extends PolymerElement  {

 Element tabElement;
 Element pageElement;
 @published dynamic selectedTab;

 ResultElementDyn.created(): super.created() {
   buildDom();
 }

 @override
 void ready() {
   selectedTab = '1';
 }

 void setSelectedInTab() {
   print('in setSelectedInTab $selectedTab');
 }

 void setSelectedInPage() {
   print('in setSelectedInPage $selectedTab');
 }

 void buildDom(){
   print('in buildDom');

  tabElement = new Element.tag('polymer-ui-tabs');
  tabElement.setAttribute("id","dtabs");
  tabElement.setAttribute("selected","{{selectedTab}}");
  tabElement.setAttribute("on-polymer-select","{{setSelectedInTab}}");

  Element spanelement = new SpanElement();
  spanelement.innerHtml = 'One';
  tabElement.children.add(spanelement);

  spanelement = new SpanElement();
  spanelement.innerHtml = 'Two';
  tabElement.children.add(spanelement);

  spanelement = new SpanElement();
  spanelement.innerHtml = 'Three';
  tabElement.children.add(spanelement);

  this.shadowRoot.append(tabElement);
  this.shadowRoot.append(new DivElement());

  pageElement = new Element.tag('polymer-ui-pages');
  pageElement.setAttribute("id","dpages");
  pageElement.setAttribute("selected","{{selectedTab}}");
  pageElement.setAttribute("on-polymer-select","{{setSelectedInPage}}");

  spanelement = new SpanElement();
  spanelement.innerHtml = 'Page 1';
  pageElement.children.add(spanelement);

  spanelement = new SpanElement();
  spanelement.innerHtml = 'Page 2';
  pageElement.children.add(spanelement);

  spanelement = new SpanElement();
  spanelement.innerHtml = 'Page 3';
  pageElement.children.add(spanelement);

  this.shadowRoot.append(pageElement);

}

Qualquer ideia? Atenciosamente, Anja