Execute Command on ComboBox Selection changed

If you are developing WPF application MVVM way you might have noticed that Button Provide a Command property that can be set to a ICommand instance and the command will be executed when button is clicked. There is no inbuilt way to set a Command that can be executed when ComboBox selection is changed. I have coded a behaviour that can be used to achieve this. Below is the code for the behaviour.

using System.Windows.Input;
using System.Windows.Controls.Primitives;
using System.Windows.Controls;
public class SelectionChangedBehaviour
{
  public static readonly DependencyProperty CommandProperty = DependencyProperty.RegisterAttached("Command", typeof(ICommand),
  typeof(SelectionChangedBehaviour), new PropertyMetadata(PropertyChangedCallback));

  public static void PropertyChangedCallback(DependencyObject depObj, DependencyPropertyChangedEventArgs args)
  {
    Selector selector = (Selector)depObj;
    if (selector != null)
    {
      selector.SelectionChanged += new SelectionChangedEventHandler(SelectionChanged);
    }
  }

  public static ICommand GetCommand(UIElement element)
  {
    return (ICommand)element.GetValue(CommandProperty);
  }

  public static void SetCommand(UIElement element, ICommand command)
  {
    element.SetValue(CommandProperty, command);
  }

  private static void SelectionChanged(object sender, SelectionChangedEventArgs e)
  {
    Selector selector = (Selector)sender;
    if (selector != null)
    {
      ICommand command = selector.GetValue(CommandProperty) as ICommand;
      if (command != null)
      {
        command.Execute(selector.SelectedItem);
      }
    }
  }
}

Set the command in xaml as shown below:

<ComboBox SelectionChangedBehaviour.Command="{Binding CommandImpl}">ComboBox>

This can be used for ListBox and ListView as well.