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I have created a custom module (call it module A) with several fields that are relate fields from another custom module (call it module B). I have created a vardefs extension for each of these relate fields that looks up data from Module B and populates it into Module A each time a record from that module is linked via one of the relate fields. I
The documentation section Manually Creating Custom Fields provides a good description of creating fields using the module loader, including dropdowns. But how can I do the same thing for dependent dropdowns, where I need to specify a parent dropdown and visibility in the $fields array?