Populating a drop down using values from data page
The picture below shows a list of products on the application, along with its type (Category, Family, Group, and Product).
I found that the above picture uses a data page called D_ProductCatalog to fill the values. The data page is of a Page type, and not list. I would like to create a section where the operator selects the category, family, group, and product using a dynamic drop down. However, when I set up each property to call the data page (for populating the choices of the drop down), no data is passed through, meaning the drop down is still empty.
How do I populate the dropdown using values from the data page?