I've usually designed Flex applications myself but this time I'll need a designer to assist with skinning the application. I've worked with this designer for a while, and we could work well on an HTML/CSS environment. He can't code, he sends me sliced PSDs which I could convert to clean code. But I'm not sure how to have him assist me with Flex UI as he's not familiar with the components.
How do you guys interface with designers for your applications?