StateHelper

statehelper.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using GalaSoft.MvvmLight.Messaging;
using GTWin8.Messages;
using GTWin8.Ui;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

namespace MvvmHelpers
{
    /// <summary>
    /// Copied from http://stackoverflow.com/questions/6002046/binding-visualstatemanager-view-state-to-a-mvvm-viewmodel
    /// </summary>
    public class StateHelper : DependencyObject
    {
        public static readonly DependencyProperty StateProperty = DependencyProperty.RegisterAttached(
            "State", typeof(String), typeof(StateHelper), new PropertyMetadata("Normal", StateChanged));


        internal static void StateChanged(DependencyObject target, DependencyPropertyChangedEventArgs args)
        {
            try
            {
                string newState = (string)args.NewValue;
                Debug.WriteLine(String.Format("Attempting change from {0} to {1} on {2} ",args.OldValue, newState, target));
                if (args.NewValue != null)
                {
                    bool res = VisualStateManager.GoToState((Control)target, newState, true);
                    Messenger.Default.Send<StateChangedMessage>(new StateChangedMessage { Control = (Control)target, NewState = newState });
                    Debug.WriteLine("Result: " + res);
                }
            }
            catch (Exception ex) 
            {
                System.Diagnostics.Debug.WriteLine("StateHelper: " + ex.Message);
            }
        }
        
        public static void SetState(DependencyObject obj, string value)
        {
            obj.SetValue(StateProperty, value);
        }

        public static string GetState(DependencyObject obj)
        {
            return (string)obj.GetValue(StateProperty);
        }
    }
}

Please answer my qestion on StackOverflow
http://stackoverflow.com/questions/14938037/statehelper-visualstatemanager-with-mvvm