Evaluating a variable to a MC name

1

I’m trying to define a target using a variable name. For example, whenever a MC lands on spot “Hot”, it sets a var = myname. I want to tell the nested movie (“prog”) inside “myname” to go to the next frame.

This is what I have that isn’t working:

on (press){
        bag.myname.prog.gotoAndStop(5);
}

I’ve also had no luck with:

on (press){
        bag.eval(myname).prog.gotoAndStop(5);
}

}