/// <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)
{
if (pageState != null && pageState.ContainsKey("ID"))
{
navigationParameter = pageState["ID"];
}
notebook = NotesDataSource.GetNotebook((String)navigationParameter) as NoteBook;
this.DefaultViewModel["Sections"] = notebook.Sections;
this.DefaultViewModel["Group"] = notebook;
notebook.PropertyChanged -= notebook_PropertyChanged;
notebook.PropertyChanged += notebook_PropertyChanged;
}