Drawing in Flex

I would like to "draw" simple shape like rectangle over an loaded image inside Image component. I don't want to alter loaded image, just to draw a rectangle for example over it with possibility to later click and interact with it. I have no idea where to start since i have no experience with drawing in Flex. What would be the best way to do that? I would really appreciate it if somene can point me in right direction.

thanks in advance

blu3,
I posted a tutorial/example on how to use the AS 3 Drawing API on my blog site:
http://tdotblog.info/?q=node/19

Basically, you create a Shape object. Use drawRect of its graphics object and attach it to an empty UIComponent. Lastily you can attach the UIComponent to anything you want.

Thank you for tutorial, it's really useful. I have one question though, i drawed the rectangle shape by defining 'UIComponent' object and then used its 'graphic' property which allowed me to use 'drawRect' and other drawing methods. Is there a reason why i should be using Shape object like you suggested over this method i used?

thanks once again,
best regards