Teie kommentaarid

You have to call InvalidatePlot() on the PlotModel when you are finished with changes.
The nuget package for universal apps is:
https://www.nuget.org/packages/OxyPlot.Windows/2015.1.881-alpha

Samples can be found in the repo:
https://github.com/oxyplot/oxyplot/tree/develop/Source/Examples/Windows

I think there are no windows phone samples, but you should see how it works.