create dynamic form with flash components depending on user input

Question

I have a flash form with different components (input, checkbox, dropdownlist etc.).

Some values of the components should be dynamic depending on user input. E.g. user can select 1 of 5 categories in a dropdownlist. Depending on his selection the sencond dropdownlist should have other values.

What is the easiest way to do that with actionscript 2? Can someone give me an example?

Then some of the form inputs should also be deactivated dynamically. E.g. if user select product "A", he's should not be able to choose a colour or select checkbox "B".

I have no experience with flash yet, so it would be nice if I could see an example of the best way to doing that.

Thanks