Dictionary for an STM

Hello all,

I'm trying to create a combo box on an STM file that Shows a custom list. It looks like you can create a Dictionary file to do this, but I can't find any documentation on how to do this. any help would be appreciated.

Honestly, I'm just playing around with the iPendant Controls list inside SharePoint Designer. I don't have a specific application, just trying to understand what else I can do with my screens.

I have a combo box, and I see the Dictionaries option in properties, and the iPendant manual just says something along the lines of "Add a a dictionary similar to %w in Forms Manager". But I don't know what that means.