creation of a line graph on a scatter point chart with gaps in the line when expected values are missing 

Something like this:

If we have a Chart with DateTimeContinuousAxis as horizontal axis, updating its Minimum and Maximum values should update the rendered in the Chart plot area data. However, if for some period (Minimum and Maximum range) there is no data, the current displayed data is not cleared.

Inconsistency in Line and Spline series performance

Resizing the window containing a CartesianChart with SplineSeries leads to some incorrect rendering between points:

If you populate the Chart with data through a SeriesDescriptor as explained here: How to Generate a Dynamic Series Using a Collection of Collections, the PointTemplate/PointTemplateSelector is not applied.

Currently the only way to apply different colors to the bars is through the ChartPalette. Provide an option to set the color according to the bound data item.  

updating data in real-time causes flickering when series are added through the series provider

Workaround: 
Add series to the chart without using the SeriesProvider option.