Cubase 7 For Mac

just gave muscore a try using while using Cubase 7(Win7) and it seemsas though I have to use either or,whichever one I start first controls my midi keyboard, if I start muscore first it's fine but then I have no keyboard in cubase and vice versa. Any ideas? I was hoping to use it as a score editor , I can;t get with the in cubase.

Cubase 7 For Mac