phase center with hfss

Hi Guys,
Does any one have experience with finding the phase center of an antenna using IE3D or HFSS. I will appreciate your insights on this or if you upload any publications or recipes that are useful for this.
Thanks,
Waveplumber

We will try to implement it into PATTERNVIEW of IE3D. All the information is there and it seems to me it should not take a long time.