She finally fixed that by creating her own mode simply copying the mode definition from Navigator, which is a clever & pragmatic way - but what’s the reason for this bug? Actually the wizard shows all modes in the platform you’re using (the IDE in that case) and doesn’t care if the Modules defining the mode is also part of your application. The Navigator Mode isn’t part of the platform (although it probably should be), and by default doesn’t get added to a new Platform Application. When the application is running, the Window System won’t find the mode and add it to the “default” mode instead, which is “Explorer”. We sorted this out during our discussions at the NetBeans Demo Camp in Munich. Should you happen to be in the Munich area join us for the next event for more neat tricks on NetBeans Platform development.