CST Observation of higher modes

Hello,

I'm working on a waveguide with 2 ports and I would like to know if is it possible with cst to watch the propagation in 3D in the structure of a higher mode when the input port is excited by the first mode?

I can only watch higher mode propagates in the structure when the input port is excited by the same higher mode (and not the fundamental).

Thank you.

Regards,
Guy