I have been following the tutorial given by I think J Grelle on youtube.
I am using the following stack
org.springframework.flex.roo.addon-1.0.0.M1.jar from 1.5.0.M1
Flash Builder Premium 4 build 272416
Mac os X 10.6.3
most of the tutorial appears to work ok but I am unable to view the flex components in design view??