* Creates a new wave with the participants of the current wave. Showing
* a popup dialog where the user can chose to deselect users that should not
* be participants in the new wave
*/
private void handleNewWaveWithParticipantsButtonClicked(Element context) {
ParticipantsView participantsUi = views.fromNewWaveWithParticipantsButton(context);
ParticipantSelectorWidget selector = new ParticipantSelectorWidget();
popup = null;
selector.setListener(new ParticipantSelectorWidget.Listener() {
@Override
public void onSelect(Set<ParticipantId> participants) {