public override async void OnViewCreated(View view, Bundle savedInstanceState)
{
base.OnViewCreated(view, savedInstanceState);
// set reference sa chartview
timeChartView = view.FindViewById <ChartView>(Resource.Id.chart_view_behavior);
timeChartView.SetOnTouchListener(this);
freqChartView = view.FindViewById <ChartView>(Resource.Id.chart_view_frequency);
freqChartView.SetOnTouchListener(this);
// time text views
txtStartTimeVal = view.FindViewById <TextView>(Resource.Id.txt_bhv_start_time_val);
txtStopTimeVal = view.FindViewById <TextView>(Resource.Id.txt_bhv_stop_time_val);
txtDurationVal = view.FindViewById <TextView>(Resource.Id.txt_bhv_dur_val);
txtHighPeak = view.FindViewById <TextView>(Resource.Id.txt_bhv_hpeak_val);
txtLowPeak = view.FindViewById <TextView>(Resource.Id.txt_bhv_lpeak_val);
txtAvePeak = view.FindViewById <TextView>(Resource.Id.txt_bhv_apeak_val);
txtLongInterval = view.FindViewById <TextView>(Resource.Id.txt_bhv_lint_val);
txtShortInterval = view.FindViewById <TextView>(Resource.Id.txt_bhv_sint_val);
txtAveInterval = view.FindViewById <TextView>(Resource.Id.txt_bhv_aint_val);
// seek bar
seekBar = view.FindViewById <SeekBar>(Resource.Id.seek_bar_behavior);
seekBar.ProgressChanged += OnSeekBarProgressChanged;
seekBar.StartTrackingTouch += OnSeekBarStart;
// seekBar.Enabled = false;
// button
//btnChangeGraph = view.FindViewById<Button>(Resource.Id.btn_change_graph);
//btnChangeGraph.Click += OnChangeGraphClicked;
gestureDetector = new GestureDetector(this.Context, this);
await presenter.LoadInitialLineChartData();
seekBar.Max = presenter.EntryCount;
// presenter.LoadChartStatistics ();
}