I am using IntelliJ 12.0 on a Mac with 64 bit Java 1.6.0. I installed the Flash UI Designer plugin. I imported a Flash (Flex) application (with .mxml files). I was able to resolve everything and when I tried to start it it seemd to work. The problem is I can't get to the Flash UI Designer. I tried to view one of my .mxml files by brinigning it up. I read somewhere that I should use the pain brush icon ("Open Design View") but it is greyed out / disabled. I cannot figure out how to enable it and get to design view. Your help is appreciated.