Adding Validation Rules to "Label" Type Form Controls

Hello Kentico Community,

I have a form that pulls in data from query strings in the URL to fill certain fields. I am using "label" type form controls for these fields, with the content set by a macro in the default value. This all works great, and the form submits successfully when the query strings are filled.

However, I noticed that the validation check never triggers, even if the value of those fields is null. I have tried making the fields required, adding "minimum length" checks, and a few other obvious solutions, but none of them have worked.

Does the "Label" form control just override all validation checks? Is there a special way I need to write this to get the expected result? Do I need to include another field to check the content of the macros?

One of the query strings is used to populate the email address in the Email Notification, so even if there is a slim chance of this error occurring I would still like to prevent it and avoid the undeliverable emails.

Thanks in advance.

-mike