in the same way, and I think that the two processes are linked, we could (in cubase 7), in the midi editor window, listen in solo one of the midi containers within a selection of several midi containers.
It does not seem possible anymore, it slowed down my workflow.
When using the divisi technique (for ex strings one midi track = 1st vl, another = 2nd vl …) or doing layering, this function is very useful.