How to get the cutoff frequency for certain modes in HFSS?

I try to analyze a structure in HFSS now, the port of the structure is a groove guide. I can see the field graph of different mode in port and I wish I can get the cutoff frequency of these modes, I think HFSS must have used this parametersin the computation, but How could I display it in the screen?

Thanks!

Depends on what type of simulation you did: eigenmode, driven terminal, or Driven modal. With eigenmode, you should be able to see it as part of your data. With the other two, you have to examine the S-parameters!