I need to pass a query string parameter to the GF, which is I can do and retrieve via hidden field and dynamic population.
However, this dynamic value is not available at gform_pre_render. I need this query string because it is a unique ID. This unique ID is used to populate DIFFERENT values dynamically into the form's fields.
For example, lets say I invoke my form: http://www.foo.com/form/?ID=1 ID=1 means that this form pertains to the state of CA. Lets say I have a dropdown of zip codes that I want to dynamically populate with only CA zip codes.
As I understand it, I must use the hook, gform_pre_render() to populate dropdowns. However, at this function, I don't see my ID field dynamically populated with the value, 1, so I can't determine what zip codes to fill in my ZIP dropdown.