how to change the frame rate of the flash player on runtime (from inside your code)

it is not so easy as you think!

to set it 60 call:

Object(FlexGlobals.topLevelApplication).stage.frameRate=60;

or... create this setter
public static function set frameRate(framerate:int):void{
    Object(FlexGlobals.topLevelApplication).stage.frameRate=framerate;
}
and call
frameRate=60;

you may also define it in mxml 
frameRate="60"

The default value of the player is 25; increasing the frame rates you consume more cpu! don't forget that you application will run in a slower computer than yours!