public override void OnInspectorGUI()
    {
        base.OnInspectorGUI();

        ScenePlacer script = (ScenePlacer)target;

        if (GUILayout.Button("Reposition"))
        {
            script.ArrangeScenes();
        }
    }
 void Start()
 {
     _scenePlacer        = GameObject.FindObjectOfType <ScenePlacer>();
     _sceneObjectManager = GameObject.FindObjectOfType <SceneObjectManager>();
 }