public ChordLinePane(string text, SongFormatOptions options, float x0, string label)
     : base(options, x0, label)
 {
     m_text = text;
 }
 public SongFormatter(string text, SongFormatOptions options)
 {
     m_panegrp = new PaneGrp();
     m_text = text;
     m_options = options;
 }
 protected Pane(SongFormatOptions options)
 {
     m_options = options;
 }
 protected LabelablePane(SongFormatOptions options, float x0, string label)
     : base(options)
 {
     m_x0 = x0;
     m_label = label;
 }
 public LabelLinePane(SongFormatOptions options, string label)
     : base(options)
 {
     m_label = label;
 }
 public ParagraphSeparatorPane(SongFormatOptions options)
     : base(options)
 {
 }
 public SongFormatPane(SongFormatOptions options)
     : base(options)
 {
 }