Question

Just curious, can you override an override in actionscript 3

Answer 1

Yes.

class Foo {
    public function bar():void { }
}

class Foo2 extends Foo {
    override public function bar():void { }
}

class Foo3 extends Foo2 {
    override public function bar():void { }
}

Note that super.bar in Foo3 will necessarily refer to Foo2.bar. Therefore if you expect to be doing this it’s sometimes handy to create a protected function in Foo2 that just calls super.bar so that you can access the base implementation when necessary.