NSCollectionView - Can't insert fields after first line

My NSCollectionView

uses a custom NSCollectionViewItem

one that contains 2 NSComboBox

, 1 NSTextField

and 1 NSDatePicker

. When I launch my app and display multiple, NSCollectionViewItems

I can tab the dropdowns and textbox of the first item, but none of the following items. If I select a textbox in the second or third element and press the tab key, nothing happens.

I would like to list each component in mine NSCollectionViewItem

and then move on to the next component in the next NSCollectionViewItem

. I expected this to be the default behavior.

Since it works for the first item in mine NSCollectionView

, I know it might work for the rest.

Is there something I need to set while NSCollectionView

displaying items?