Datagrid action submits form

Hi!

I have a form containing among other things a (new) data grid.

Clicking any action in the datagrid submits the form.
(Even with no workflows defined on the datagrid.)

Am I missing something, or is this a bug?

The problem is solved if i move the datagrid outside the form, but for my layout that means also moving the submit button outside the form (making validation more complicated).