Helping on Project Base Application is difficult because it is related to many issues, such as Classes, SDK, Framework, Components, Custom Assets and many other things which depend on individual style of Programming. MXML has good recourses of helps but no one cannot write help with every possible combinations. Its like html or xml, there is no rule how you decorate your pages and what best tag structure will work on every browser.
On forums, if someone asks why his project is not going to work by showing a portion of code which doesn’t make sense to others, the thread will die. Similarly, if someone post their entire project and asks how this going to work, will result the same, because no one has such time to inspect it and give solution.
This is not same in Flash as Flex, because in Flash, people comes asking helps, are usually designers or beginners, or they come to ask for methods or logic which is very easy to answer. Very small amount of developers asks help for complex application and for those types of help they get samples and examples from net.
MXML or Pure AS3 on Flex/FlashBuilder is not built for designers. If a designer wants to adopt it, he has to make himself strong enough on Programming. As everything in Flex is Code Base. This is same in Java too. Designers get pain to understand how all the things works.
Staying with such programming will teach amazing things, other than that you will get nothing.