I am developing a charting app and want to use WinRT XAML Toolkit data visualization in both (Windows Phone 8.1 and Windows 8.1) of the projects in my universal app.
How can I do this?
Unfortuatly WinRT XAML Toolkit (https://winrtxamltoolkit.codeplex.com/) only work for Windows Runtime XAML applications.
My recommendation is that you create 2 pages (sadly) or usercontrols and use winrtxamltoolkit for your windows 8.1 app and another data visualization toolkit like telerik maybe for the windows phone 8.1 (http://www.telerik.com/products/windows-phone/overview/all-controls/chart.aspx).
With a bit of luck you will be able to bind the same property on both controls, best of luck!