This code name has no relationship to the Ruby programming language.
 As programs become more complex, the differences between WPF and Windows Forms become more apparent.
 This is similar to the Visual Basic “default property” feature.
 We can do this by adding
System.Windows.Markup.ContentPropertyAttribute to the type.
 After this chapter, I will omit the “…/xaml/presentation” and “…/xaml” namespaces from markup samples. I will consistently map the presentation (WPF) namespace to be the default XML namespace, and “x” as the prefix for the XAML namespace.
 We will see later that even in navigation scenarios a window is created for page-based applications.
 The naming convention for code-behind ...