How can I make the DataForm render the DataFields when the currentitem is null

Question

I have a DataForm bound to the selectedItem of a listbox. Before the user selects an item in the listbox the DataForm is blank, by that I mean there is absolutely nothing displayed, no labels, textboxes or anything. Once the user selects an item in the listbox then then the form renders data as expected.

How do I get the form to display all the fields, (without data of course) even if there isn't a currentItem?