RadChart.ExportToXPS/ExcelML should support exporting multiple charts to a single XPS/Excel document.

REASON FOR DECLINATION
This is supported out-of-the-box by the RadPdfProcessing.

Allow for rendering multiple nested pie/doughnut series together.

Support for multiple X axes on the same chart area.

eg: Graphing the amount of products sold, per category, as a bar chart
+ a line chart showing the cumulative total of products sold over the past year.

REASON FOR DECLINATION
This is supported out-of-the-box by the new RadChartView.

Add RotationAngle property so series item labels can be rotated wih C# / VB.NET code.

The user needs to replace the TextBlock with a CheckBox.

REASON FOR DECLINATION
This is supported out-of-the-box by the new RadChartView (axes have a LabelTemplate property).

Implement option for automatic layout for axis item labels as the current mechanisms that solve the label overlapping issues with many data points have their limitations:

LabelRotationAngle - The desired rotation angle changes based on how many data point

REASON FOR DECLINATION
This is supported out-of-the-box by the new RadChartView (axes have a LabelFitMode and a SmartLabelsMode property).

Track values of current mouse cursor X position.
Can be seen here: 
http://www.google.com/finance?q=INDEXDJX:.DJI,INDEXSP:.INX,INDEXNASDAQ:.IXIC
and here:
http://people.iola.dk/olau/flot/examples/tracking.html

REASON FOR DECLINATION
This is supported out-of-the-box by the new RadChartView (TrackBallBehavior & CrosshairBehavior).

Currently the axis labels are rotated around their center. The rotated labels top edge should be aligned with the center of the corresponding data point (e.g. bar).

REASON FOR DECLINATION
This is supported out-of-the-box by the new RadChartView.

Add more google financial style features so the zoom control can be overlayed on a chart.

http://www.google.com/finance?q=INDEXDJX:.DJI,INDEXSP:.INX,INDEXNASDAQ:.IXIC

Missing tick mark on plot area axis (value = 0), when the other plot area axis is not visible.

The XAML team has recently reviewed this issue and will not be addressing it as at this time the team is focusing on the bugs impacting the highest number of developers. If you have encountered this issue and it is blocking for your work please contact us through the support ticketing system with details on your setup and a reference to this item.

Add loading indicator / IsBusy support for RadChart.

Implement Box and Whisker 2D (boxplot) type in RadChart.

On data change RadChart should redraw only the series items that are actually changed, and not the whole series.

REASON FOR DECLINATION
This is supported out-of-the-box by the new RadChartView.

Implement two-dimensional Radar / Polar series type for WPF / Silverlight.

REASON FOR DECLINATION
This is supported out-of-the-box by the new RadChartView.

Implement two-dimensional Funnel series type for WPF / Silverlight.

Available in R3 2017 Official Release Version.

In some scenarios you have to graph some non-linear functions, e.g. exponential, 1/y.  It would be nice if there were integrated support how to specify this.