if (response.isOnOff()) presentation.deIconify(); else {
if (response.isOnOff()) { if (presentation != null) presentation.deIconify(); } else {
    private void handleDisplayViewerRelatedAgents(DisplayViewerRelatedAgent                                                 response)    {        if (response.isOnOff()) presentation.deIconify();        else {            if (presentation != null) removePresentation();         }    }