[MX] Forms, Validation, etc

Okay, I wanted to learn ActionScript but have been forced into it at work and I have some issues that I can’t seem to resolve and would love some help because I am the guru at my place of business (scary thought).

  1. I need an input text field to be mandatory, but I also need a specific format placed in that box

  2. I need a set of radio buttons to be mandatory as well.

  3. My form generates and email to allow the user to attach files if need be and there is one sentence that is in the email that needs to be bolded.

  4. Is there a way to modify the look of the component scrollBar?

I would greatly appreciate the help, thanks.