add liferay portlet in vaadin application


I have a question to integration a liferay portlet in vaadin. In my portal liferay, I want call manually a liferay portlet (Calendar) to add in modal window.
Well I think there are two steps for that:
→ Use portletListener in Application to catch the context liferay and use his service layer.
It’s certainely possible to get portlet
Portlet portlet = PortletLocalServiceUtil.getPortletById(“PORTLET_ID”);
but the layout is necessary…
→ Adding the instance of portlet in modal component
The Liferay portlet must be added without layout. Well I have no idea to include the portlet directly in modal.