Add click event for axis items.

REASON FOR DECLINATION
This is supported out-of-the-box by the new RadChartView (axes have a LabelTemplate property, use it to customize appearance and handle click).

Keep the underlying data item for sampling functions like First, Last, Min and Max.

First / last series item labels get clipped if they are large enough in some scenarios.

REASON FOR DECLINATION
This is supported by the new RadChartView (use the ClipToPlotArea property of the series or use a smart labels strategy).

The chart area is virtually split into a Grid of n rows an m columns. For each cell you can specify a color.

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

Dragging pie slices is not supported at present. The current implementation hooks the MouseLeftButtonDown event to manage the visual transition from selected to unselected state and vice versa. So it is not possible to integrate with other solutions where 

The control should be able to automatically distribute the axis item labels on different step levels in order to improve the text visibility of very long axis item labels. Currently this functionality is supported only manually through the AxisX.StepLabelL

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

Add multi-touch support for zoom/scroll, double tap, etc.

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

When two or more range series are used -  the range bars are overlapping each other, they are being placed one on top of another instead of being placed next to each other (as is the behaviour with regular bar series).

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

Bindings don't work for axes in the AdditionalAxes collection of the chart area. Wpf only.

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

Allow the chart to be put in a "series/item hovered" state by API.

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

In Charts with many Y-Axis, it would of great help to link the interaction features of the series with the Y-Axis it is mapped against, basically dimming/hiding the other Y-Axis. It would make it easier for users to find the Axis the series belongs to.

RadChart1.DefaultView.ChartLegend.LegendItemStyle = this.Resources["CustomLegendItem"] as Style; 
does not have effect when it is set on button click.

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

When updating the ItemSource, the labels are formatted before the update of all items is completed.

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).

Although the DefaultView property is a dependency property, you cannot create template bindings for it in the RadChart style.

When using a MarkedZone in the chart and than try to change dynamically the theme €“ it throws an InvalidOperationException

Axis labels need to be styled individually; for example: different axis labels to have different colors.

RadChart throws an exception when placed inside the page content of a WPF FixedDocument ("FixedDocument is not a Visual or Visual3D").

In statistics, a moving average, also called rolling average, rolling mean or running average, is a type of finite impulse response filter used to analyze a set of data points by creating a series of averages of different subsets of the full data set.

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When KeepExtremes sampling function is used, EmptyPointBehavior.Gap and EmptyPointBehavior.Drop settings are ignored and points appear as if EmptyPointBehavior.Zero is used.