Sparkfun ESP8266 Thing SerialEvent does not fire.

Technically not a Wireless question, but figured that because this is a ESP8266 issue, folks in this forum will probably know best.

Trying to read a simple RS232 serial stream but cannot get the Sparkfun ESP8266 serialEvent() event to fire using the stock SerialEvent example sketch. Was this event class implemented in the ESP8266 Thing and does it work?