AE 6.1 M033 for DITA: How to add values to the New Document dialog window

How can we populate the New Document window with new objects that we'd like to support for DITA? We've updated the ditabase.dcf file to include the new values, but when we select File > New, the values fail to display. Our goal is to see the new objects in the list, and upon clicking on it, an XML template opens and allows authors to start creating content.