How do I access variable for Vertical box in User Widget?

Thank you! I thought there would be a function to get a variable by name or something similar.

I want the main menu to show the user a list of buttons, each shows the name
of a category of puzzles.
I have a Data Table with a large number of rows. Each row is for a puzzle. One of the columns is the puzzle category. I have this blueprint to pull the unique categories into an array:


I want to create the menu from the data, not hard-code it.

I am doing this in the Construction Script so I can see the UI in the editor before launching the game. If I move it to the Begin Play event, I am afraid I won’t see it until after launch (I could be wrong about this).