Listing files for users selecting choice

I know that in AppleScript you can choose a folder with images, and how to list them with “theList”.

But when the list with all the images appears, you can’t typ the first letter of a file name to automatically go to the first file in the list with that letter. You have to scroll to search it yourself.

How can I make it possible, when the list appears, to type the first letter or number of the file name to select it?