just to complete the original thread:

My problem is solved. I changed the Action of the 
"Menu (long)" - Key from "Virtual Keypress Menu(long)" 
to "Menu on/off" and after that it works as desired.

Thanks so far

@Justin:

I recommend you open a new thread, because the title in here 
does not reflect your issue and others, who have a similar issue, 
like you wouldn't read in here.