private void AddMemberMenuItem_Click(object sender, Avalonia.Interactivity.RoutedEventArgs e)
        {
            Member          newmember = new Member();
            NewMemberWindow nmw       = new NewMemberWindow(newmember, false);

            nmw.Closing += NewMemberWindowClosed;
            nmw.ShowDialog(this);
        }
 private void EditMember_Click(object sender, Avalonia.Interactivity.RoutedEventArgs e)
 {
     if (dataGrid.SelectedIndex != -1)
     {
         Member          updatedMember = (Member)dataGrid.SelectedItem;
         NewMemberWindow nmw           = new NewMemberWindow(updatedMember, true);
         nmw.Closing += NewMemberWindowClosed;
         nmw.ShowDialog(this);
     }
 }