/// <summary>
/// Method to invoke when the NavigateToAboutViaViewModel command is executed.
/// </summary>
/// <param name="parameter">The parameter of the command.</param>
private void OnNavigateToAboutViaViewModelExecute(object parameter)
{
    var parameters = new Dictionary<string, object>();
    parameters.Add("Data", "navigated from home");

    var navigationService = GetService<INavigationService>();
    navigationService.Navigate<AboutViewModel>(parameters);
}

protected override void OnNavigationCompleted()
{
    NavigationData = string.Empty;
    if (NavigationContext.ContainsKey("Data"))
    {
        NavigationData = NavigationContext["Data"] as string;
    }
}

    /// <summary>
    /// Interaction logic for CreateMessage.xaml.
    /// </summary>
    public partial class EditMessage : EditMessageIntermediate {
        /// <summary>
        /// Initializes a new instance of the <see cref="CreateMessage"/> class.
        /// </summary>
        public EditMessage() {
            InitializeComponent();
        }
    }

    /// <summary>
    /// Intermediate class for CreateMessage since Silverlight doesn't support generic base classes.
    /// </summary>
    public class EditMessageIntermediate : Page<EditMessageViewModel> {

    }

   public class EditMessageViewModel : ViewModelBase {
        /// <summary>
        /// Initializes a new instance of the <see cref="EditMessageViewModel"/> class.
        /// </summary>
        public EditMessageViewModel() {
            CommandSave = new Command<object>(OnCommandSave);
            CommandCancel = new Command<object>(OnCommandCancel);
         }

        /// <summary>
        /// Gets the title of the view model.
        /// </summary>
        /// <value>The title.</value>
        public override string Title { get { return "Edit Message"; } }

        /// <summary>
        /// Gets or sets the navigation data.
        /// </summary>
        public MessageItem MessageItem { get; private set; }

        #region Methods

        protected override void  OnNavigationCompleted() {

            if (NavigationContext.ContainsKey("MessageId")) {
                int theKey = (int)NavigationContext["MessageId"];
                var service = DBUpdateServiceFactory.GetDBUpdateService();
                service.GetMessageCompleted += new System.EventHandler<GetMessageCompletedEventArgs>(service_GetMessageCompleted);
                service.GetMessageAsync(theKey);
            }
        }

        void service_GetMessageCompleted(object sender, GetMessageCompletedEventArgs e) {
            MessageItem = e.Result;
            if (MessageItem != null) {
                OnViewModelPropertyChanged(this, "MessageItem");
            } else {
                var navigationService = GetService<INavigationService>();
                navigationService.Navigate<MessageListViewModel>();
            }
        }

        #endregion

        // TODO: Register models with the vmpropmodel codesnippet
        // TODO: Register view model properties with the vmprop or vmpropviewmodeltomodel codesnippets
        // TODO: Register commands with the vmcommand or vmcommandwithcanexecute codesnippets

        /// <summary>
        /// Gets the NavigateToMessages command.
        /// </summary>
        public Command<object> CommandSave { get; private set; }

        /// <summary>
        /// Method to invoke when the NavigateToAboutViaViewModel command is executed.
        /// </summary>
        /// <param name="parameter">The parameter of the command.</param>
        private void OnCommandSave(object parameter) {

            var service = DBUpdateServiceFactory.GetDBUpdateService();
            service.UpdateMessageAsync(MessageItem);
            service.UpdateMessageCompleted += new System.EventHandler<System.ComponentModel.AsyncCompletedEventArgs>(service_UpdateMessageCompleted);
            service.CloseAsync();

        }

        void service_UpdateMessageCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e) {
            var messageService = GetService<IMessageService>();
            messageService.ShowInformation("The Item has been updated...", "Info", ((Action)(() => {
                OnCommandCancel(MessageItem.MessageId);
            })));
        }



        /// <summary>
        /// Gets the NavigateToMessages command.
        /// </summary>
        public Command<object> CommandCancel { get; private set; }

        /// <summary>
        /// Method to invoke when the NavigateToAboutViaViewModel command is executed.
        /// </summary>
        /// <param name="parameter">The parameter of the command.</param>
        private void OnCommandCancel(object parameter) {
            var navigationService = GetService<INavigationService>();
            navigationService.Navigate<MessageListViewModel>();
        }
    }

    public class EditMessageIIViewModel : ViewModelBase {
        /// <summary>
        /// Initializes a new instance of the <see cref="EditMessageIIViewModel"/> class.
        /// </summary>
        public EditMessageIIViewModel() {
        }

        protected override void OnNavigationCompleted() {
            int id = (int)NavigationContext["MessageId"];
        }

        /// <summary>
        /// Gets the title of the view model.
        /// </summary>
        /// <value>The title.</value>
        public override string Title { get { return "View model title"; } }

        // TODO: Register models with the vmpropmodel codesnippet
        // TODO: Register view model properties with the vmprop or vmpropviewmodeltomodel codesnippets
        // TODO: Register commands with the vmcommand or vmcommandwithcanexecute codesnippets
    }

The Page:
<Views:EditMessageIIIntermediate x:Class="RomanticaWeb.Views.EditMessageII"
                      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
					  xmlns:catel="http://catel.codeplex.com"
					  xmlns:Views="clr-namespace:RomanticaWeb.Views">
    
    <!-- Resources Note that in the template it's called Page:Resources - that didn't work -->
    <Views:EditMessageIIIntermediate.Resources>
    </Views:EditMessageIIIntermediate.Resources>

    <!-- Content -->
    <Grid>
        <TextBlock Text="Here goes your real content" />
    </Grid>
</Views:EditMessageIIIntermediate>