Liferay and Vaadin cross-portlet


I’m developing Vaadin portlet for Liferay portal and I stumbled upon a problem I’m not able to solve. I’ve implemented two Vaadin portlets, one of them is for rendering menus and the second one is for rendering view (they communicate using Liferay IPC for Vaadin plugin). When specific menu item is clicked, the corresponding view is rendered in the view portlet.

The problem is I have to integrate one of the links with existing portlet (Orbeon Form Builder Proxy) written for Liferay. I want to embed the portlet inside the Vaadin view portlet. Is there any solution to do this? If not, is there any other possibility (different portlet arrangement maybe) to overcome the problem?

Thanks in advance.