Run-Configuration not visible in menus

Hi!

I've created a small example language for generating some python files (using plaintextgen).

Now it would be perfect if I could start these generated files from within MPS.

So I create a Run-Configuration, Configuration Kind, Producer, Executor etc. (based on the information available at https://www.jetbrains.com/help/mps/run-configurations.html). But I seem to be missing some important step because my Run-Configuration doesn't show up in the context menu of my solution and also not in the 'Run' menu.

Does maybe somebody know a tutorial for this topic? or knows common pitfalls?

Thanks in advance!

Gerhard