actionscript 3 - How do I refer to an instance from inside it's own code in Adobe Flash -

In Adobe Flash, I have a movie clip that is pressed on the keyboard when it is added to the stage. I want to visit it on screen and it disappears after reaching the edge of the stage. At the moment I use this but the image appears and then closes here my code is:

  addEventListener (Event.ADDED_TO_STAGE, runtime); Var c = 0 function runtime () {while (this.x <800) {this.x + = 12; } Remove child (this); }  

thanks

Unfortunately, it seems that it is = There is no override for the operator and therefore + = 12 is just adding 12 for an integer, in fact not to change the image again, you have to figure out how the image was drawn and erased. Maybe to see a little downright routine.