I don't know the best way to approach this problem, or even if I can implement it in Flash Builder 4.5.
I want to have a row of cards along the bottom of my window, and each one in turn would pop up as I roll over it. Ultimately I want to click on that thumbnail and have a larger one appear in the main part of the window.
Is this something that can be done in Flex, or should it be created in Flash and imported into Flex?
You can definitely do something like this in Flex. Check out http://www.adobe.com/devnet/flex/articles/flex4_effects_pt1.html for some starter information Flex effects and animations. Also, I'd recommend Chet Haase's book "Flex 4 Fun" (http://www.amazon.com/Flex-4-Fun-Chet-Haase/dp/0981531628/ref=sr_1_1?ie=UTF8&qid=132376981 6&sr=8-1 ) as a good resource for this area.