private void ShowPeople_Click(object sender, EventArgs e)
        {
            this.ContentExists.Text = string.Empty;
            List <PersonDTO> people = service.GetItemPersons(this.itemPath).ToList();

            if (people.Count > 0)
            {
                this.dataGridView1.DataSource = people;
            }
            else
            {
                this.dataGridView1.DataSource = new List <PersonDTO>();
                this.ContentExists.Text       = "No Content";
            }
        }