/// <summary>
        /// </summary>
        private void HandleAddRemoveButtons()
        {
            if (ImGui.Button("Add"))
            {
                var tp = new TimingPointInfo()
                {
                    StartTime = (int)AudioEngine.Track.Time,
                    Bpm       = 0
                };

                var game   = GameBase.Game as QuaverGame;
                var screen = game?.CurrentScreen as EditorScreen;
                screen?.Ruleset.ActionManager.Perform(new EditorActionAddTimingPoint(WorkingMap, tp));

                SelectedTimingPoints.Clear();
                SelectedTimingPoints.Add(tp);
                NeedsToScroll = true;

                TextTime = tp.StartTime.ToString(CultureInfo.InvariantCulture);
                TextBpm  = $"{tp.Bpm:0.00}";
            }

            ImGui.SameLine();

            if (ImGui.Button("Remove"))
            {
                if (SelectedTimingPoints.Count == 0)
                {
                    return;
                }

                var game   = GameBase.Game as QuaverGame;
                var screen = game?.CurrentScreen as EditorScreen;

                var lastTp = SelectedTimingPoints.Last();

                screen?.Ruleset.ActionManager.Perform(new EditorActionRemoveTimingPoints(WorkingMap, new List <TimingPointInfo>(SelectedTimingPoints)));

                SelectedTimingPoints.Clear();

                if (WorkingMap.TimingPoints.Count != 0)
                {
                    var sv = WorkingMap.TimingPoints.FindLast(x => x.StartTime <= lastTp.StartTime);

                    if (sv != null)
                    {
                        TextTime = sv.StartTime.ToString(CultureInfo.InvariantCulture);
                        TextBpm  = $"{sv.Bpm:0.00}";
                        SelectedTimingPoints.Add(sv);
                    }
                    else
                    {
                        TextTime = "";
                        TextBpm  = $"";
                    }
                }
                else
                {
                    TextTime = "";
                    TextBpm  = $"";
                }

                NeedsToScroll = true;
            }
        }