In my current project need to extend an already existing controller.

I tried with the usual way: drag & drop then select "link".

After that I cant select application node (TypeError: 'undefined' is not an object) and derivated controller shows no code and there is nothing I can do with it.

Obviously controller inheritance is not supported and designer allowed me to d&d because (I guess) is a core functionallity.

Controller inheritance will be supported?