Datatype Select - Refresh

I have a select listbox that I want refreshed if a value changes on a select listbox in a different tab (it’s a tab form application). Is there a way to progmatically force a select datatype to refresh without using this option in the configuration? It’s kind of hard to explain why I need to do this but I can’t find any documentation which allows you to code in an event a refresh of a datatype select.