Does Vaadin 7 have a scheme for blocking navigation if a form is "dirty" (m

Thought I read about some new confirmation dialog in Vaadin 7, but now cannot find it. We have our own scheme using Vaadin 6, but wondered if there was now support for closing windows or otherwise navigating away when changes have been made but not committed? Thanks!

For Navigator you can do something like this following
this tutorial
.

Thanks, Henri. That looks like what I had read about but couldn’t find again.