private static void DrawMuteSolo(Rect fullArea, InMusicNode node)
        {
            Rect butArea = fullArea;

            butArea.width  = 16;
            butArea.height = 12;
            butArea.y     += 3;
            butArea.x     += EditorGUI.indentLevel * 5 + 5;

            Texture mute = MusicUpdater.IsMute(node) ? EditorResources.Instance.Muted : EditorResources.Instance.NotMute;

            if (GUI.Button(butArea, mute, GUIStyle.none))
            {
                InUndoHelper.RegisterUndo(node, "Mute");
                MusicUpdater.FlipMute(node);
            }

            butArea.y += 14;
            Texture solo = MusicUpdater.IsSolo(node) ? EditorResources.Instance.Soloed : EditorResources.Instance.NotSolo;

            if (GUI.Button(butArea, solo, GUIStyle.none))
            {
                InUndoHelper.RegisterUndo(node, "Solo");
                MusicUpdater.FlipSolo(node);
            }
        }