The title says it all. In the XAML toolbox I am only able to use the XAML controls (those located in universal windows components tab) and no other, but there is no chart of any sort availible. So, I am interested if there is anyone who found any free 3rd party toolkits.
The following is the winrt toolkit that contains a free charting control.
https://winrtxamltoolkit.codeplex.com/
It also contains many other useful controls.