HI, I have chart view with area and column series:

ComboChart.Frame = new RectangleF (10f, 40f, UIScreen.MainScreen.Bounds.Width, 200f);
            ComboChart.BackgroundColor = UIColor.Clear;
            ComboChart.AnimateSeriesWhenAxisRangeChanges = true;
            ComboChart.ZoomDisplayType = IGChartZoom.IGChartZoomNone;

            _areaSource = new IGAsyncCategoryDataSourceHelper ("Value", "Label");
            _areaData = GenerateData (ViewModel.AreaData);
            _areaSource.Delegate = new AsyncDataSource (_areaData);

            _columnSource = new IGAsyncCategoryDataSourceHelper ("Value", "Label");
            _columnData = GenerateData (ViewModel.ColumnData);
            _columnSource.Delegate = new AsyncDataSource (_columnData);

            _xAxis = new IGCategoryXAxis ("xAxis") {
                LabelBrush = new IGBrush (_grayColor),
                MajorStroke = new IGBrush (_grayColor),
                Stroke = new IGBrush (_grayColor),
                Gap = 5,
                Extent = 20,
                UseSmartAxisPanel = true
            };

            _yAxis = new IGNumericYAxis ("yAxis") {
                LabelBrush = new IGBrush (_grayColor),
                MajorStroke = new IGBrush (_grayColor),
                Stroke = new IGBrush (_grayColor),
                Minimum = 0,
                Maximum = 100,
                Extent = 30
            };

            float red;
            float green;
            float blue;
            float alpha;
            UIColor.Orange.GetRGBA (out red, out green, out blue, out alpha);
            var orangeBrush = new IGGradientBrush (UIColor.Clear);
            orangeBrush.AddColorStop (0.5, new IGBrush (red, green, blue, 0.75f));

            _areaSeries = new IGAreaSeries ("areaSeries") {
                MarkerType = IGMarkerType.IGMarkerTypeNone,
                XAxis = _xAxis,
                YAxis = _yAxis,
                Thickness = 2,
                Outline = new IGBrush (UIColor.Red),
                Brush = orangeBrush,
                IsTransitionInEnabled = true,
                TransitionDuration = 500,
                DataSource = _areaSource
            };
            _columnSeries = new IGColumnSeries ("columnSeries") {
                MarkerType = IGMarkerType.IGMarkerTypeNone,
                Thickness = 0,
                Brush = new IGBrush (_grayColor),
                XAxis = _xAxis,
                YAxis = _yAxis,
                IsTransitionInEnabled = true,
                TransitionDuration = 500,
                DataSource = _columnSource
            };

            ComboChart.AddAxis (_xAxis);
            ComboChart.AddAxis (_yAxis);
            ComboChart.AddSeries (_areaSeries);
            ComboChart.AddSeries (_columnSeries);

            _scrollView.AddSubview (ComboChart);

And when I update data in sources in first way:

                    _areaData.RemoveAt (0);
                    _columnData.RemoveAt (0);
                    ComboChart.RemoveItem (0, _areaSource);  
                    ComboChart.RemoveItem (0, _columnSource);  

                    _areaSource.Values = _areaData.ToArray ();
                    _columnSource.Values = _columnData.ToArray ();

axis are updated, but series aren't.

When I update data in second way:

 ViewModel.UpdateShowingData (min, max);
                _areaData = GenerateData (ViewModel.AreaData);
                _areaSource.Delegate = new AsyncDataSource (_areaData);
                _areaSeries.DataSource = _areaSource;

                _columnData = GenerateData (ViewModel.ColumnData);
                _columnSource.Delegate = new AsyncDataSource (_columnData);
                _columnSeries.DataSource = _columnSource;

series are hidden in chart, and for updating chart I need make zoom manually.

Refresh method doesn't work.

How I can update chart view. Thank you.