[Bug or feature] nested class inheritance

[BCS]

Reply to David,

> Thank you very much for the quick answer.
> Maybe I miss some important point, but I don't understand why the
> processing
> order explains the behaviour.
> In my original code the situation looks like this:
> 
[...]

A nested class can only be derived from by another class nested inside the 
same class. As far as I am concerned, this is a design bug or mis-feature. 
I to have wanted to do exactly what you were trying to do. I could be wrong 
but I can't see any reason that it should be hard to implement.