The best thing for an incipent grease fire contained in a pot or frying pan is to just put a lid on it.
I saw one of those new aerosol can extinguishers on sale at the hardware store so I bought it. I showed it to my wife and told her I figured it would be more intuitive for her to use that the dry chem in case of a grease fire. She replied "Why do you think I keep a throw rug in front of the stove?" Smart lady.
Not sute what you exsacly mean with a aerosol can extinguisher but if a pan full of oil is on fire, than either put the lid on, a fire blanket or use a special grease extinguisher. A aerosol can doe'sn't sound like any of them...