public override void OnInspectorGUI()
 {
     if (_player == null)
     {
         _player = (CVRVideoPlayer)target;
     }
 }
    private void OnEnable()
    {
        if (_player == null)
        {
            _player = (CVRVideoPlayer)target;
        }

        reorderableList = new ReorderableList(_player.entities, typeof(CVRVideoPlayerPlaylist), true, true, true, true);
        reorderableList.drawHeaderCallback    = OnDrawHeader;
        reorderableList.drawElementCallback   = OnDrawElement;
        reorderableList.elementHeightCallback = OnHeightElement;
        reorderableList.onAddCallback         = OnAdd;
        reorderableList.onChangedCallback     = OnChanged;
    }