Add support for 3D Surface Series Type.

This feature is now available as part of the ChartView control since R3 2016 Official release. Refer to the link below for more information.
http://docs.telerik.com/devtools/wpf/controls/radchartview3d/series/surfaceseries3d.html

Possible positions: 
- above or below the X axis 
- left or right of the Y axis

Introduce a way to set a geometry for the chart series' data points. Currently you cannot easily change the geometry of the default visual of PointSeries and LineSeries, for example. We can also introduce a default visual geometry selector.

Ability to specify a cursor during a drag-to-pan operation. One way to work-around this is to use the attached property in the sample project attached here. 
This is the code needed to start using the solution:
<telerik:RadCartesianChart local:ChartUtilities.PanCursor="Hand" />

"Insert" operation is not supported properly for chart series but is handled like "Add" i.e. RadCartesianChart.Series.Insert(0, series) will not result in inserting the series at zero index but internally it will be added to the end of the collection and it will be treated as last series.

Available in version 2014.3.1215.

Add grid interval property in order to control the number of grid lines with respect to the number of ticks on the axes.

Add support for 3D Surface Series Type.

This feature is now available as part of the ChartView control since R3 2016 Official release. Refer to the link below for more information.
http://docs.telerik.com/devtools/wpf/controls/radchartview3d/series/surfaceseries3d.html

Add support for specifying different tooltip templates for each series.

Add support for tooltip visualization over the continuous series segments that would interpolate the actual value between data points.

XAML Team reviewed this request and decided not to address it in the future. Appropriate way to get this is to use the crosshair behavior.

Implement Waterfall series type (http://en.wikipedia.org/wiki/Waterfall_chart).

Implement a new LabelFitMode that prevents the axes labels from overlapping by increasing the LabelInteval.
Declined: This is no longer necessary after introducing the SmartLabelsMode.

Gaps appear between the bars in the stacks when the series are populated with negative and positive values. Check the attached picture.

If you have a scenario with mixed values (positive and negative) use RangeBarSeries instead of BarSeries.

Enable the TrackBallInfo to be vertically aligned (e.g. the bottom of the chart).

Make the StepLineSeries being able to plot a 'step' for a single point. Currently the StepLine series does not support drawing a single data point when it is in the beginning or the end of the ItemsSource. 

When the CartesianPlotBand annotation is bound to the vertical axis its 'From' value doesn't align with the axis.
This changes when resizing.

Add auto-range ability for the numeric axes that adjusts its range in accordance to the visible/zoomed data to show the data more clearly

RadPieChart throws an exception whenever is in a DataTemplate of an ItemsControl with over 120 instances. The ItemsControl uses a RadUniformGrid as an ItemsPanel. Project is attached.

RadPieChart labels are clipped when RadiusFactor is 1.0

ChartDataSource control should perform the sampling operation asynchronously in a background thread so that it is not blocking the UI thread.