i use flow command :
sencha -sdk D:\dev\ext\ext-4.2.1.883 generate app -t ext-theme-neptune msg .\
then i check the /.sencha/app/sencha.cfg file, the app.theme still like this app.theme=ext-theme-classic,
and the bootstrap.css still is @import 'ext/packages/ext-theme-classic/build/resources/ext-theme-classic-all.css'.
how could i change the app theme by using sencha cmd?