Draw a Hand Signature in Flex 4

I am creating an application that requires a user to draw their hand signat开发者_开发问答ure on a tablet. Does anyone the best way to do this on Flex mobile 4.5? What do I draw on to, a Sprite, canvas?

Also, I would need to save the signature as a .jpg, could this be done?

Have a look on the following:

http://www.jamesward.com/2010/03/22/flex-paint-updated-to-flex-4/

It may give you some hints.

The BlackBerry-provided sample signature capture app ought to be a good starting point.