How to Bind Data to Dynamically Created Form

How to Bind Data to Dynamically Created Form

I'm trying to build a form which starts with a drop-down and depending
upon the option selected creates a second drop down. I can create the
second drop down using FormEvents just fine, but what I can't do is
pre-select an option in that second drop-down once it is created. Does
anyone know how to bind data to a form element created via FormEvents?