private void AddTodo_MenuClick(object sender, RoutedEventArgs e)
        {
            AddEditDialog addEditDialog = new AddEditDialog(this);

            if (addEditDialog.ShowDialog() == true)
            {
                ReloadList();
            }
        }
        private void LvTodos_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            Todo currTodo = lvTodos.SelectedItem as Todo;

            if (currTodo == null)
            {
                return;
            }

            AddEditDialog addEditDialog = new AddEditDialog(this, currTodo);

            if (addEditDialog.ShowDialog() == true)
            {
                ReloadList();
            }
        }