<p:menuitem value="#{es_bundle.IniciarSesion}" outcome="login"/>`.

<h:panelGroup id="display">
<p:panelGrid columns="2" rendered="#{userController.selected != null}" >
<p:outputLabel value="Usuario" for="username" />
<p:inputText id="username" value="#{loginBean.username}"/>
<p:outputLabel value="Contraseña" for="password" />
<p:password id="password" value="#{loginBean.password}"/>
</p:panelGrid>
<p:button value="#{es_bundle.IniciarSesion}" outcome="#
 {loginBean.login()}"/>
                <p:outputLabel value="No tienes cuenta? " />
                <p:button value="Registrarse" outcome="register"/>
                <p:button value="No iniciar sesión" outcome="index"/>
            </h:panelGroup>