there is more info here . note the slightly differing versions of the include
INCLUDE "LCD_PCF8574.pbp" ; Include LCD module for PCF8574
INCLUDE "LCD_PCF8574a.pbp" ; Include LCD module for PCF8574

http://support.melabs.com/threads/10...hlight=PCF8574
http://support.melabs.com/threads/10...hlight=PCF8574
ps
LCD_Addr CON $7E is way different to addr used in above threads