Entering variable-length lists in a Form Guide

Hi,

I'm creating a Form Guide to capture user input, and the Guide is backed by a DataModel.  One of the DataModel entities has a field, OWNERS, of type string[].  I want to allow the user to enter a list of String values that can be used to populate this field - however, i'm struggling to see which Control Type will allow me to do this.

Ideally, the input would look like a text field (for the first entry in the collection) followed by 2 buttons - '+' and '-'.  Clicking on the '+' button would add a new text field underneath the first one to allow for the entry of a second entry, etc.  The UI doesn't necessarily need to be as rich as this - but I do need some way of allowing the user to insert a variable length list.

Any thoughts?

Regards,

Craig