TINA/Spice/LMG5200: measure power disipation

Part Number:LMG5200

Tool/software:TINA-TI or Spice Models

I am experimenting with the TINA-TI Reference Design "snom478c.tsc" for TINA and one of the key values to measure is the power disipation of the GaN device itself under different conditions. How can I measure or get this info from TINA ?