public void Bind(PersonViewModel viewmodel)
{
TxtName.SetBinding(TextBox.TextProperty, new Binding("Name"));
TxtBirth.SetBinding(TextBox.TextProperty, new Binding("BirthText"));
BtnNext.Click += new RoutedEventHandler(
(sender, e) => { viewmodel.GetNextPerson(); });
this.Loaded += new RoutedEventHandler(
(sender, e) => { viewmodel.GetNextPerson(); });
this.DataContext = viewmodel;
}