Hasbro (NYSE:HAS) has pulled an about face and is trading over 1% higher Tuesday, after slipping 2% lower earlier, after the firm issued a revenue warning.The toy maker said its preliminary Q4 sales would come in at $1.33 billion, blow consensus estimates of $1.39 billion.The firm sees FYH 2011 EPS up only 2% to 4% after domestic and Canadian weakness following Thanksgiving impacted its growth.