How to create a behavior model of D Flip Flop in ADS ?

The design is created using the "Analog/RF Network" Type of Network, not "Digital Signal Processing Network". I can find in "DSP Network" some logic blocks or HDL blocks, but in the "Analog/RF" I can not find. Is it possible to define some behavior logic models in th "Analog/RF network" environment?

There was a similar discussion here:

http://www.designers-guide.org/Forum...num=1129334751

focused on Verilog-AMS for divider circuits.

how can I insert Verilog-A in ADS (A.D.S) "Analog/RF Network" environment?