Perhaps other do see this, but I don't. In source view you can press "F1" while on an object and you get the help for that item. But if you switch over to design view, you don't have that kind of help. Or am I just doing something wrong?
It just doesn't work like that, at least in the FB version I have. If you have a complex UI you can always select something in design view and switch to source view--it will have selected that item's source text. If you have a rather large or complicated mxml screen that can help you find the component you're needing help on a little faster, not much help, I know. But I don't consider it a major issue since it works in source view. =)