How can I add text fields to AjaxFileUpload control?

See more:

C#

ASP.NET

Ajax

File-Upload

I am working on uploading mp3 files to the web server (eventually to the cloud). The AjaxFileUpload works great, except I need it to do a little more to collect some meta data about the files I am uploading. Example: song name, song genre, artist name, part of album(y/n), etc. This data will be recorded in a SQL table.

Using the OnUploadStart event, I can do any validation for any fields I want to add. The problem I have is, when I add multiple songs at once, how do I generate the extra text input fields to correspond to each file? Meta data for a file could be extensive, so I would like to add buttons to the uploader that will trigger a modal popup or something, and I'll input my meta data there.

This is what I currently have...
http://www.cooldrew.com/fileuploadsample/fileupload.jpg

And this is what I want to get too...
http://www.cooldrew.com/fileuploadsample/fileupload2.jpg


Adding the buttons in the right place is my first challenge. Assuming I can do this, the 2nd challenge is, after entering the data in each pop-up for each row, how do I tie the data I enter to each file?

Thanks for any advice.