Hi Shawn,
Have you tried the latest version of IntelliJ plugin (1.1.0.final)? If not, lets try to update the plugin to the latest version. It should work with the same behaviour in Eclipse plugin.
If updating the plugin still doesn’t work, could you please provide me more information about your developemnt environment (what is your OS, java version, intelliJ version,…) and the project structure (Maven project, plain java project or …). It would be nice if you can describe the steps when you create a new design, what happens with the Designer, does it show any error or strange things in IntelliJ?
Best regards,
Tien.