It's perfectly explained in the docs. So, please, stop saying it isn't.
http://static.springsource.org/spring-webflow/docs/2.0.x/reference/htmlsingle/spring-webflow-reference.html
How to use tiles in spring: 10.5 View resolution (link + #spring-mvc-config-spring-view-resolution)
How to use Ajax with tiles in spring: 11.5: Handling Ajax request (link + #spring-js-ajax)
Copy the code from those links and you will end up with something like this:
Configuration for webflow to use Tiles:
Configuration for Tiles:
/WEB-INF/views/layouts/page.xml
/WEB-INF/views/layouts/table.xml
/WEB-INF/views/globalViews.xml
/WEB-INF/views/userViews.xml
Configuration for Tiles + Ajax: