I do not quite understand your question.
"Submit" is an html-world term and we do not really submit forms in Flex.
Instead, we use a data service call to send the data to some middle tier
application like JSP, Java, ASP.Net, CF, etc.
Say what you want to do in some other words.
Data is saved to a database by again using a call to a data service to send
the data to a middle tier program which does the actual save.