Flex Classes be used in Flash CS3 pro???

Question

I wrote some classes in Flex that use the Canvas Class. I
want to use it in a Flash widget I'm making, but when I try and
import and run my class in CS3, it says this:
1017: The definition of base class Canvas was not found.
How can I set up a connection to those classes?

Answer 1

You can use any version of air if you're willing to use the command line.
In CS5.5, AIR for Mobile was introduced. CS5 supported iOS only originally and not via AIR but a direct arm7 compile. I don't have CS5 on here anymore to check but the main issue was always the publish panel simply didn't support the correct publish options. Even the CS5.5 panel doesn't support the latest AIR SDK options either (localized names, descriptions, ANEs and a lot more). Even in CS5.5 you have to overlay over the AIR2.6 folder because it's hard-coded to look in that folder for the SDK so it always says it's exporting AIR 2.6 (but it's the latest 3.5).
What you might want to do is try these instructions only use 3.5 instead of 2.7. Changing the SWF version number is about the only real difference (SWF version 18 for FP 11.5/AIR 3.5).
http://blog.prevail.co.nz/2011/06/21/overlaying-air2-7-in-flash-cs5/