View difference between Paste ID: Q5v53k6c and

-
+public class FocusManagerExtensions
 {
 	public static readonly DependencyProperty IsFocusedProperty = DependencyProperty.RegisterAttached("IsFocused", typeof(bool?), typeof(FocusManagerExtensions), new FrameworkPropertyMetadata(IsFocusedChanged));
 	public static bool? GetIsFocused(DependencyObject element)
 	{
 		if (element == null) {
 			throw new ArgumentNullException("element");
 		}
 
 		return (bool?)element.GetValue(IsFocusedProperty);
 	}
 
 	public static void SetIsFocused(DependencyObject element, bool? value)
 	{
 		if (element == null) {
 			throw new ArgumentNullException("element");
 		}
 
 		element.SetValue(IsFocusedProperty, value);
 	}
 
 	private static void IsFocusedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
 	{
 		object fe = (FrameworkElement)d;
 
 		if (e.OldValue == null) {
 			fe.GotFocus += FrameworkElement_GotFocus;
 			fe.LostFocus += FrameworkElement_LostFocus;
 		}
 
 		if ((bool)e.NewValue) {
 			fe.Focus();
 		}
 	}
 
 	private static void FrameworkElement_GotFocus(object sender, RoutedEventArgs e)
 	{
 		((FrameworkElement)sender).SetValue(IsFocusedProperty, true);
 	}
 
 	private static void FrameworkElement_LostFocus(object sender, RoutedEventArgs e)
 	{
 		((FrameworkElement)sender).SetValue(IsFocusedProperty, false);
 	}
 }