public class VisualStateHelper : DependencyObject
    {
        public static string GetVisualStateProperty(DependencyObject obj)
        {
            return (string)obj.GetValue(VisualStatePropertyProperty);
        }
 
        public static void SetVisualStateProperty(DependencyObject obj, string value)
        {
            obj.SetValue(VisualStatePropertyProperty, value);
        }
 
        public static readonly DependencyProperty VisualStatePropertyProperty =
            DependencyProperty.RegisterAttached(
                "VisualStateProperty",
                typeof(string),
                typeof(VisualStateHelper),
                new PropertyMetadata((s, e) =>
                {
                    var propertyName = (string)e.NewValue;
                    var ctrl = s as Control;
                    if (ctrl == null)
                        throw new InvalidOperationException(
                            "This attached property only supports types derived from Control.");
                    ctrl.SetBinding(CurrentViewStateProperty, new Binding(propertyName));
                }));
 
        private static readonly DependencyProperty CurrentViewStateProperty =
            DependencyProperty.RegisterAttached(
                "CurrentViewState", 
                typeof(string), 
                typeof(VisualStateHelper), 
                new PropertyMetadata((s,e) =>
                {
                    var ctrl = s as Control;
                    if(ctrl == null)
                        throw new InvalidOperationException("This attached property only supports types derived from Control.");
                    VisualStateManager.GoToState(ctrl, (string)e.NewValue, true);
                }));
    }