Using externally defined SSAS Cube in AX 4.0?

Quoting from:
http://msdn.microsoft.com/en-us/library/aa834400(AX.10).aspx

It says:
Is it possible to view cubes that were not created in the product?
Yes.

My question is, how? (In Dynamics AX 4.0). I want to create cubes in DevStudio and be able to open them from the AX UI just like cubes created in AX. Any help would be appreciated.