NotFound.view.xml

<mvc:View
	controllerName="sap.ui.demo.nav.controller.NotFound"
	xmlns="sap.m"
	xmlns:mvc="sap.ui.core.mvc">
	<MessagePage
		title="{i18n>NotFound}"
		text="{i18n>NotFound.text}"
		description="{i18n>NotFound.description}"
		showNavButton="true" // Activación de Back Button
		navButtonPress="onNavBack"/> //evento  
</mvc:View>