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@InjectComponent
private Zone userInput;

@InjectComponent
private Zone helpPanel;

@Inject
private AjaxResponseRenderer ajaxResponseRenderer;

void onActionFromRegister()
{
    ajaxResponseRenderer.addRender("userInput", userInput)
                userInput).addRender("helpPanel", helpPanel);
}

@Inject
private Form registrationForm;

@Inject Block registrationHelp;

Object onActionFromRegister()
{
    return new MultiZoneUpdate("userInput", registrationForm)
        registrationForm).add("helpPanel",
        .add("helpPanel", registrationHelp);
}