nested-checkboxes

Zend Framework Nested Checkboxes

I would like to create a Zend_Form with nested checkboxes. I'm sure that it's possible, but I don't remember how to do it. This is what it would look like: [x] Top level checkbox 1 [ ] Sub level 1 [x] Sub level 2 [ ] Top level 2 [ ] Sub level 1 [ ] Sub level 2 How would I achieve this result? ...