Why dont radio buttons and dropdown boxes or submit button work on PDF? Like they did with FormsCentral.

Do you mean having the same design in the PDF submission as in the standalone version of the form?

PDF submission:

Because this is our formatted way to present submissions data, it will not carry the same style/design as in the form, that is the reason why, drop downs,  radio buttons, submit buttons etc, are not shown in the PDF.

Unfortunately there is no way to change that at the moment, but if you like, I can forward a your feature request to our development team, so if it gets implemented, you will be notified. 

Please open a new thread if you need anything else, we will be glad to assist you.