EDIT

package eu.etaxonomy.cdm.vaadin.view.registration;

import java.util.Collection;

import org.springframework.security.core.GrantedAuthority;

import org.vaadin.viritin.fields.LazyComboBox;

        continueButton.setEnabled(false);

        continueButton.addClickListener(e -> {

            referenceCombobox.commit();

            if(referenceCombobox.getValue() != null){

            }

            getViewEventBus().publish(this,

                new RegistrationEditorAction(EditorActionType.ADD,

                        // passing the refId is hack, bit for some reason the presenter is always referring to the wrong view

                        continueButton,

                        StartRegistrationViewBean.this)

                );