Vst The Grand 3 doesn't appear in cubase 5

I’ve just bought the Grand 3.
I installed it on 64 bit windows 7 using the 64 bit software version.
The stand alone version works perfectly, but when I try to use it through cubase, it does not appear in the list of vst instruments of cubase 5.
I also tried to find the location of the resources of vst on my hd to share on cubase 5, but I can not find them.
What can I do?