thanks a lot for Your answer. I have the Zibo B737 installed too. After some trouble and informations from a guy of the Aerosoft community, I find the missing Perf Parameters and so today I was able to fly also with VNAV PATH.
What I am missing, is, that it is not possible to open the FMS in a separate window. Programming is possible by zooming. But during the flight it´s hard to look at it. But it works.
The other point is, You can store a plan, but until now I do not find a way to call it up again. Sorry FMS is really new for me, I am not well experienced at this moment. I should look for a CPL training course .
The FMS installed in the standard B737 gives a lot of challenge for me. If You press VNAV, N1 and LVL CHG will be automaticly activated. You will see that VNAV PATH is "on" and the plane climbs to the adjusted VNAV altitude. So far so good. To descend at the initial point, I switch back to V/S and activate than VNAV again. The Question is, is it a bug or a fault by me.
Nevertheless, I think I use for the next future the Zibo, as You required.