I\'m trying to create a binding from code in a library that targets multiple frameworks (WPF, WinRT, UWP etc), and I\'m hitting a brick wall. The property I\'m trying to bind to
Good question, after researching and discussing we've confirmed that in UWP, we cannot programmatically binding to custom attached property. Sadly.
You may submit a request to add this new features for development through the Windows Feedback tool.