Using attached behaviors

We can resolve the Binding issue of controls exposing non-dependency properties by using attached behaviors. This technique is a simple matter of registering an attached property, which is implemented as dependency properties in WPF. We can use the attached property as a binding target and whenever the source value changes, we can pass the updated value to the non-bindable property.

To do this, add a new class called WebBrowserAttachedBehavior and define it as follows:

namespace UsingNonMVVMElements.AttachedBehaviors
{
    using System.Windows;
    using System.Windows.Controls;
 
    public class WebBrowserAttachedBehavior
    {
        public static DependencyProperty SourcePageProperty =
            DependencyProperty.RegisterAttached("SourcePage", 
                typeof(string), typeof(WebBrowserAttachedBehavior),
                new PropertyMetadata("", OnSourcePagePropertyChanged));
 
        public static string GetSourcePage(DependencyObject obj)
        ...