RTS354's post in Can't program the launch bar on the F-18 to stay down. was marked as the answer
OK, just figured it out. Apparently, the description part of the controls screen was hidden, so all I saw was the Launch Bar Extend/Off, etc, and not the description. So once I expanded the description field, I was applying my key bindings to the circuit breakers of the Launch Bar instead of the Launch Bar switch. So now everything is working. Thanks for the suggestions.