How to use nested class in WPF XAML?

Question

I am refactoring the code from sample:

• 24.129.21. Master Detail Binding
  from C# / CSharp Tutorial » Windows Presentation Foundation » Binding)

Answer 1

Unfortunately, what you want to do is not possible in XAML (from MSDN):

Your custom class must not be a nested class. Nested classes and the "dot" in their general CLR usage syntax interfere with other WPF and/or XAML features such as attached properties.