Methods are missing on OxyPlot.Wpf when using NuGet

Hi everbody,
I just started working with OxyPlot on my WPF project. So the first thing that I noticed is that when I import OxyPlot.Core and OxyPlot.Wpf using NuGet there are some methods missing, e.g. the method RefreshPlot(bool), but there are even more missing. I found another OxyPlot DLL on GitHub where these methods are included. Of course I can use this DLL but I just want to ask if I am doing anything wrong importing this references? Or why are some methods missing when I import the OxyPlot references?

Thanks to everybody in advance!!!