Implementing a SceneManager using OpenFL

I'm trying to implement a basic SceneManager using OpenFL and Haxe. I don't have a lot of experience using OpenFL and Haxe so I have a few problems.

Here is how I designed the SceneManager class:

package;

import openfl.display.Sprite;
import openfl.Lib;

class SceneManager extends Sprite
{
    private var currentScene: ...;

    public function new(rootScene: ...)
    {
        super();

        currentScene = rootScene;
        Lib.current.addChild(currentScene);
    }

    public function changeScene(newScene: ...): Void
    {
        Lib.current.removeChild(currentScene);

        currentScene = newScene;
        Lib.current.addChild(SceneTwo);
    }
}

The "..." should be replaced with a general "class" type that can hold any of my scenes.

If anyone can help me solve this I would be really grateful.