Problem simulating FSM

Hi,

I am trying to simulate a FSM using vector simulator...
the state machine variable is called "Tstep_Q", I added it to waveform editor... however, when I start the functional simulation
all signals are displayed and change over time except the Tstep_Q signal!! It stays Undefined.
While I was trying to resolve this issue I noticed that the simulator is throwing a warning says: "Warning: Tstep_Q - signal not found in VCD."
I managed to solve another signal had the same problem "incr_PC" by using the directive /* synthesis keep */.

Any clue would be appreciated... I have been trying to figure it out tow days ago!!

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