How to generate simulation model for PCIe endpoint

Hi,

I'm using Megawizard 12.1 to generate PCIe core.

In previous versions, I remembered there were a checkbox for you to generate simulation model at the end of Megawizard core customization. That will generate an .vo file for me to simulate the hard ip.

In 12.1 i don't see any ?!?!

Where the heck is it?

Jeff