private void btnAdd_Click(object sender, EventArgs e)
        {
            CoordinateSystemDefinition cs = CoordinateSystemDialog.NewCoordinateSystem();

            if (cs != null)
            {
                _presenter.AddNew(cs);
            }
        }
        private void btnEdit_Click(object sender, EventArgs e)
        {
            CoordinateSystemDefinition cs = this.SelectedCS;

            if (cs != null)
            {
                string oldName = cs.Name;
                if (CoordinateSystemDialog.EditCoordinateSystem(cs))
                {
                    _presenter.Update(oldName, cs);
                    _presenter.Refresh();
                }
            }
        }