What I am trying to achieve is to populate a child combobox with items which depend on a \'parent\' combobox.
To clarify the - or better my - problem, I have created
This should be what you're after:
http://jsfiddle.net/TsxTU/1/
How this works is its using the select as label for item in group syntax. So for the first select box, whatever the user selects will become the object bound to currentGroup. A similar thing is done for currentItem
We can then, optionally, use a $watch expression to be notified of that update and ensure that currentItem updates to the first item in the new group's Items array.