Mock method on concrete type for certain input values

Hi,

I'm new to TypeMock, and I'm trying to figure out if it supports a specific use case that I have. I have a concrete type with a method. And I was to have the return of that method be controlled by my test (to return a mock), but only if a certain input type is passed in. If any other input type is passed in, the actual method on the concrete type should be called.

I seem to be able to get TypeMock to either always intercept the call and return the mock, or always allow the concrete call, but not dynamically based on input value.

Any enlightenment you could provide would be greatly appreciated.

Thanks,

~ Justin