InfoPath Dev

How to do this:

Scenario:
1. We have a secondary data source that holds a list of entries
2. a listbox that lists the values in the data source
3. two buttons add am remove
4. a lisbox to receive items selected from the first listbox.

Operation:
Adding
1.select one item from the first lisbox
2. click to ADD button
3. Add item to second lisbox.

Removing
viceversa adding.

somebody??
Thanks,

Hi Fred,
I think you have answer in your question,
Maintain two lists and bind one each to the two dropdown. Initially your second dropdown does not contain any values.
When you click on add button, you will prepare a node of the second list and append it to the second list.

Thanks Agni,

But, How to do to prepare the node to append a new item, really that's my problem.
Doy you have any example?
Thanks a lot.