problem triggering inter-portlet communication

I’m trying to get some communication between 2 portlets on the same page both Vaadin-applications using events.
But I don’t manage to trigger the event publishing.
The only way I have found to do this, should be submitting a form.
This should trigger the processAction-method in the ApplicationPortlet.
How can I trigger this using Vaadin-UI.


If you are using Liferay, then the
add-on might be worth of testing.