private void EditMenu_Click(object sender, RoutedEventArgs e)
 {
     if (lvToDo.SelectedItem != null)
     {
         EditPopup ep = new EditPopup(lvToDo.SelectedItem as ToDoItem);
         ep.Owner = this;
         ep.ShowDialog();
     }
 }
 private void EditMenu_Click(object sender, RoutedEventArgs e)
 {
     if (lvToDo.SelectedItem != null)
     {
         EditPopup ep = new EditPopup(lvToDo.SelectedItem as ToDoItem);
         ep.Owner = this;
         ep.ShowDialog();
     }
 }