/// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override void LoadState(Object navigationParameter, Dictionary <String, Object> pageState)
        {
            // TODO: Create an appropriate data model for your problem domain to replace the sample data
            SampleDataSource.AddContactsGroup();
            var sampleDataGroups = SampleDataSource.GetGroups((String)navigationParameter);

            this.DefaultViewModel["Groups"] = sampleDataGroups;
        }