public static void OpenMenu()
 {
     window = (AddExistingSceneToGameLevel)GetWindow(typeof(AddExistingSceneToGameLevel), false, "Add Existing Scene To Level");
     WindowRefresh.RefreshLevelsList(out window.levelOptions, out window.selectedValue, out window.levels, out window.gameLevelData);
     window.targetGameLevel = window.levels[window.selectedValue];
 }
 private void AddExistingSceneToExistingLevel()
 {
     AddExistingSceneToGameLevel.OpenMenu();
 }