@Override
 public void setDisplayerList(Set<String> displayerNames) {
   displayerList.clear();
   for (String name : displayerNames) {
     displayerList.addItem(name);
   }
 }
 @Override
 public void addOrganizationalUnit(final String item, final String value) {
   organizationalUnitDropdown.addItem(item, value);
 }
 @Override
 public void addOrganizationalUnitSelectEntry() {
   organizationalUnitDropdown.addItem(CoreConstants.INSTANCE.SelectEntry());
 }