When the legend has many items a scrollbar should appear.

Steps to reproduce:
1. Add chart to a form.
2. Add two bar series with CombineMode set to Stack100
3. Add two data points to the series with values 0.0 and identical category
4. Run the project an you will see an exception.

ADD. RadChartView - add waterfall series type.

http://www.telerik.com/help/wpf/common-export-support.html

Resolution: 
Add an option to export the chart to an image or a stream using the ExportToImage methods.

To reproduce: use the following code snippet:

 Random rand = new Random();
 List<LineSeries> list = new List<LineSeries>();
 for (int i = 0; i < 15; i++)
 {
     LineSeries ls = new LineSeries();
     ls.LegendTitle = "Series" + i;
     list.Add(ls);
 }
 for (int i = 0; i < 1000; i++)
 {
     foreach (LineSeries s in list)
     {
         s.DataPoints.Add(new CategoricalDataPoint(i, rand.Next(0, rand.Next(5, 20))));
     }
 }
 radChartView1.Series.AddRange(list.ToArray());

 this.radChartView1.ChartElement.LegendPosition = LegendPosition.Bottom;
 this.radChartView1.ChartElement.LegendElement.StackElement.Orientation = Orientation.Horizontal;

Resolution: 
The issue is duplicated with item IMPROVE. RadChartView - ChartLegend should be able to wrap its items. From Q1 2015 when there are many items in the chart legend a scroll bar will appear so users can scroll through the items.
More info in the following feedback item http://feedback.telerik.com/Project/154/Feedback/Details/149848-add-radchartview-when-the-legend-has-many-items-a-scrollbar-should-appear

The lasso controller does not zoom properly the vertical axis - the interval is not correct. 

Workaround: 
public class Lasso : LassoZoomController
{
    protected override ActionResult OnMouseUp(MouseEventArgs e)
    {
        if (e.Button != MouseButtons.Left)
        {
            return base.OnMouseUp(e);
        }

        if (MouseDownLocation != MouseMoveLocation)
        {
            Point point = (Point)typeof(LassoZoomController).GetMethod("ClipLocation", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic).Invoke(this, new object[] { e.Location });
            this.MouseMoveLocation = point;
            SizeF areaSize = SizeF.Empty;
            CartesianArea area = this.Area.View.GetArea<CartesianArea>();

            if (area != null)
            {
                IChartView chartView = this.Area.View;
                var temp = area.GetType().GetMethod("GetCartesianClipRect", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance).Invoke(area, null);
                areaSize = ((RectangleF)temp).Size;
                double delta = this.Area.View.Viewport.Width - areaSize.Width + this.Area.View.Viewport.X;
                double start = ((this.MouseDownLocation.X - chartView.PlotOriginX - delta) / areaSize.Width / chartView.ZoomWidth) * 100;
                double end = (MouseMoveLocation.X - chartView.PlotOriginX - delta) / areaSize.Width / chartView.ZoomWidth * 100;
                double zoomFactor = 100d / Math.Abs(start - end);

                double deltaHeight = this.Area.View.Viewport.Height - areaSize.Height + this.Area.View.Viewport.Y;
                double startH = ((this.MouseDownLocation.Y - chartView.PlotOriginY - deltaHeight) / areaSize.Height / chartView.ZoomHeight) * 100;
                double endH = (MouseMoveLocation.Y - chartView.PlotOriginY - deltaHeight) / areaSize.Height / chartView.ZoomHeight * 100;
                double zoomFactorH = 100d / Math.Abs(startH - end);

                if (zoomFactor < 1d)
                {
                    zoomFactor = 1d;
                }

                if (zoomFactor > 100d)
                {
                    zoomFactor = 100d;
                }

                if (zoomFactorH < 1d)
                {
                    zoomFactorH = 1d;
                }

                if (zoomFactorH > 100d)
                {
                    zoomFactorH = 100d;
                }

                double pan = (((areaSize.Width - 1) * zoomFactor) / 100) * Math.Min(start, end);
                double panH = (((areaSize.Height - 1) * zoomFactorH) / 100) * Math.Min(startH, endH);

                this.Area.View.Zoom(zoomFactor, zoomFactorH);
                this.Area.View.Pan(-pan, -panH);
            }
        }

        ViewResult result = typeof(LassoZoomController).GetField("result", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic).GetValue(this) as ViewResult;
        result.ShouldInvalidate = true;


        return new ViewResult() { ShouldInvalidate = true };
    }
}

Add RightToLeft support in DrillDownNavigator.

Currently values can only increase from left to right and from bottom to top.

Currently the axis data flows from left to right starting with the smallest values and increasing. There should be a way to verse this flow and the most left values to be the biggest.

so that Y increases as you move down the screen. (Even) microsoft chart component supports this. 

One should be able to add annotations at certain positions within RadChartView.

http://www.telerik.com/help/winforms/chart-features-marked-zones.html

To reproduce:

BarSeries barSeries = new BarSeries("Performance", "RepresentativeName");
barSeries.Name = "Q1";
barSeries.DataPoints.Add(new CategoricalDataPoint(177, "Harley"));
barSeries.DataPoints.Add(new CategoricalDataPoint(128, "White"));
barSeries.DataPoints.Add(new CategoricalDataPoint(143, "Smith"));
barSeries.DataPoints.Add(new CategoricalDataPoint(111, "Jones"));
barSeries.DataPoints.Add(new CategoricalDataPoint(118, "Marshall"));
this.radChartView1.Series.Add(barSeries);
this.radChartView1.GetArea<CartesianArea>().Orientation = Orientation.Horizontal;

RadChartView - user should be able to enter minimum/maximum width for Bars in BarSeries.

Currently, when you zoom in and out, the position the mouse is initially hovering is not kept, while it should

Add Range series similar to those provided by WPF/SL

http://demos.telerik.com/silverlight/#ChartView/Gallery/Range

Add Scatter area series support for RadChartView.

Axes should allow custom formatting for each individual label. Consider the following scenario - a chart provides information for each hour of the day. Each label should contain only the hours data, however, when the date changes the label should contain the full date information.

Introduce mechanism that will allow the vertical axis to appear at a certain position regardless of the size of its labels. For reference see Stock Series \ Indicators example.