Vaadin 8 Grid unbuffered edit

I have some problems using the Vaadin 8 Grid unbuffered edit mode.
I have created Bindings for the editable columns.
After a double click I can edit the cells and use the mouse or Tab/Shift-Tab to navigate between the cells.
The Binder seems to write the changed values in the beans.

But:

  • My SaveListener never gets an event
  • Editor.save() has no effect
  • I can not close the Editor with saving the current edited value. I can only cancel() the edit mode.

What is the designated way to save the values in unbuffered mode (to the database for example)?
How do I know which values have been changed in which beans?

Any help would be appreciated.