private void AddButton_Click(object sender, RoutedEventArgs e)
{
var x = (sender as Button).DataContext as SpiritListViewModel;
var spirit = new SpiritViewModel()
{
Title = "new Spirit."
};
x.List.Add(spirit);
SpiritWindow.Show(spirit, x.List);
}
public void Show(SpiritViewModel data, ObservableCollection <SpiritViewModel> spirits)
{
this.DataContext = data;
this.Spirits = spirits;
this.Show();
}