Dynamically create a message
are you trying to raise any kind of error message or you want to have confirmation ?
if you want to raise exception, then it's possible , check in the addons/account.py 
you'll find something that you are looking for.
I have a button on a new form. When this button clicked I need a show some information on new form using label /or other component/. How to do it in OpenERP 6? I don't have any idea. Please give me a hand. thanks.