ImageSnapshot and PNGEncoder in Flash

As usual I've come across something easy to do in Flex but not in Flash. Flex
has ImageSnapshot and PNGEncoder to get a .png out of a display object.
I was wondering if there were any way to do this in flash without using a 3rd party API
as I can't distribute a license with my app.
I'm using Flash CS5. I wish there was as much support for Flash as there is for Flex.
I've had to write my own tree component, if I'd have used Flex I could have just used the
Flex tree component. I'm hoping I don't have to write my own display object to png class
myself.
Cheers,
Alex.

The AS3 core lib has a jpeg encoder, png encoder and some other nice utility classes.
http://github.com/mikechambers/as3corelib
Been around for years...

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