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

When a System.Windows.Interactivity.EventTrigger is attached to a ChartTrackBallBehavior a XamlParseException is thrown. A possible work-around for this would be to set the CommandParameter to be the parent collection of the behavior and not the behavior itself.

Introduce DesiredTickCount property for the DateTimeContinuousAxis.

XAML Team reviewed this request and decided to not address it in the future.

We introduced the ability for the axis to change step based on its size, so that labels do not overlap and presently we see no value in having such a DesiredTickCount property (whats even more the axis already has a MaximumTicks property).

Provide a way to synchronize Trackball and Crosshair behaviors.

XAML Team reviewed this request and decided not to address it in the future. 

Add support for categorical PointSeries type (i.e. ScatterPointSeries equivalent that supports DateTime data.

Add support for chart series animations.

Users should be able to create custom financial indicators.

In a chart that displays more than one series, it would great to be able to turn on/off the trackball feature on a per-series basis. (Currently, suppressing the display of data for a given series doesn't prevent the trackball from snapping to points on that series - a weird experience for the user.

When the values of the data points have great values and the axis has a very small manual range, the Path element does not render correctly and is at times not visible at all.

Workaround:
A possible way to resolve this is to use the Direct2DRenderOptions. The different render modes use a completely different rendering logic.
<telerik:LineSeries.RenderOptions>
 <telerik:Direct2DRenderOptions />
</telerik:LineSeries.RenderOptions>

The fix is available in LIB Version 2015.1.0406.

Add mechanism for getting the layout slot of the axis

Add ScatterRangeSeries visualization, similar to RangeSeries.

Add support for drill-down functionality.

Add support for Tornado Chart. You can check this link for more information.

Sample Tornado Chart:

Add mechanism in RadCartesianChart to change the axis origin position. Currently, you can position it only top, left, right or bottom. Add an option to position the axis at an arbitrary position on the opposite axis. For example, to position the horizontal axis in the middle of the vertical axis or at value lets say 3.

Please add the Contour series for showing the scatter (X,Y) lines which are connecting the points with the equial Z- coordinate. Currently a scatter 3D surface (X,Y,Z)  can now be shown only as 3D chart.

Often it is necessary to show 3D surface as 2D chart with lines connecting (X,Y) points with "same Z-level" .

Samples:

• Geographic map showing the contour lines of the same height: https://en.wikipedia.org/wiki/Contour_line ,
• Map of the points with the same temperature inside the 3D container,
• ...

References:

• https://www.infragistics.com/help/winforms/datachart-scatter-contour-series 
• https://www.infragistics.com/help/winforms/geographicmap-using-geographic-contour-line-series 
• https://mathworld.wolfram.com/ContourPlot.html 

 

DateTimeContinuousAxis produces too many labels when zoom in to the max and then zoomed out with double clicking the slider. The result is different when zooming out while dragging the slider and when double clicking it.

When setting MajorTickInterval, the actual interval used in display is adjusted when zooming to show a reasonable number of ticks. However, if LabelInterval is used along with it to achieve the desired number of labels on the chart, LabelInterval is not adjusted along with MajorTickInterval, resulting in too many or too few labels being displayed. Moreover the automatic adjustment of MajorTickInterval cannot be disabled, leading to problematic label display that cannot easily be handled by the developer without inside knowledge of the algorithm. 

Nice features would be:
- Adjust LabelInterval along with MajorTickInterval to keep approximately the same number of labels on the chart.
- Given the above, add an option to allow the Chart to determine the optimal MajorTickInterval and LabelInterval by itself (currently if MajorTickInterval is not specified, it displays ALL category ticks which can be way too many for the display)
- Add an option to disable the MajorTickInterval automatic adjustment if the programmer wishes to handle this manually

This suggestion arose out of this forum thread, which includes an example demonstrating the issue:

http://www.telerik.com/forums/majortickinterval-trouble-when-zooming