I downloaded the free fersion of Tina. http://focus.ti.com/docs/toolsw/folders/print/tina-ti.html I built a basic 555 timer circuit but can't see any way to run it. I checked help and form the looks ogf it, there is supposed to be a Run command on the menu but I am not seeing it. I loaded one of the sample simulations and don't see a run command either. How do I run the simulation?