private void SceneGroupToggle(MapzenMap mapzenMap, SceneGroup.Type type)
    {
        bool isSet = SceneGroup.Test(type, mapzenMap.GroupOptions);

        isSet = EditorGUILayout.Toggle(type.ToString(), isSet);

        mapzenMap.GroupOptions = isSet ?
                                 mapzenMap.GroupOptions | type :
                                 mapzenMap.GroupOptions & ~type;
    }
 void OnEnable()
 {
     this.mapzenMap = (MapzenMap)target;
 }