I am new user to Flex 4 and I have just gone through Lynda.com - Flash Builder 4 and Flex 4 Essential Training tutorial. However, when I do online searching for examples for building air application in flex, all the sample provided is for Flex 3 version. I am having trouble with nearly all the examples to have it work properly. Is it possible to have flex 3 structure running in flex 4 version? Or, is there any website provide complete Flex 4 example? Thanks.
Try these links for Flex 4....
I would also thoroughly recommend that you purchase the Adobe Flex 4 training from the source volume 1 book. Start at the beginning and work through each chapter in turn. This book starts with the basics and builds up slowly to reasonably complex stuff. Don't try to do the complex stuff straight away - you need to thoroughly understand the basics first.
Yes you can use flex 3 in flash builder4.