protected override void AddButton(GameObject target, AudioSource audioSourceDown, AudioSource audioSourceUp)
        {
            KnownFolderButton button = Undoable.AddComponent <KnownFolderButton>(target);

            PopulateButton(button, audioSourceDown, audioSourceUp);
        }
 public void PopulateButton(KnownFolderButton button, AudioSource audioSourceDown, AudioSource audioSourceUp)
 {
     base.PopulateButton(button, audioSourceDown, audioSourceUp);
     button.knownFolder = knownFolder;
     button.filePanel   = filePanel;
 }