Help with Argen

Hi I want to do some small prototyping with Postgres and XOJO.
From the past I have the paid version of ARGEN. It works for simple form, I dint find anything for related data filling dropdowns.

Q1: can somebody help me with an example ?
Q2: are there alternatives ( I don’t need a big client server solutions ) ?
Q3; I saw in the newest Xojo Release notes there is a db class? Would this be a better option as my XOJO Version is from last year.

Thx, now Im back to do things in XOJO (rapid prototyping for DevOps concepts ), and I do hope my work will also promote XOJO to others.