Thanks it works. Here is the code in case anyone else needs to the do the similar thing:
EventManager.RegisterClassHandler(typeof(MainWindow), CloneService.CloneCreatedEvent, new EventHandler<DependencyObjectItemRoutedEventArgs>(OnCloneCreatedEvent));
...
...
private static void OnCloneCreatedEvent(object sender, DependencyObjectItemRoutedEventArgs e)
{
((ActiproSoftware.Windows.Controls.Ribbon.Controls.Button)e.Item).DataContext = ((ActiproSoftware.Windows.Controls.Ribbon.Controls.Button)e.Source).DataContext;
}