public DifficultyButton(PETrackDifficulty trackDiff, Button button)
     : base(trackDiff.MidiTrack, trackDiff.Difficulty)
 {
     this.Button = button;
 }
 public DifficultyButton(PETrackDifficulty trackDiff, Button button)
     : base(trackDiff.MidiTrack, trackDiff.Difficulty)
 {
     this.Button = button;
 }